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AdityaHongunti
Had Russian lieutenant colonel Stanislav Petrov not correctly judged the early warning system’s reports of an incoming nuclear missile on September 26, 1983, to be false and disobeyed orders from his superiors to retaliate, Russia and the United States would likely have entered a large-scale nuclear war.


A. Had Russian lieutenant colonel Stanislav Petrov not correctly judged the early warning system’s reports of an incoming nuclear missile on September 26, 1983, to be false and disobeyed orders from his superiors to retaliate, Russia and the United States would likely have entered a large-scale nuclear war.
( this format of the sentence feels a little awkward though )

B. If Russian lieutenant colonel Stanislav Petrov had not correctly judged the early warning system that reported an incoming nuclear missile on September 26, 1983 to be false and then disobeyed orders from his superiors to retaliate, Russia and the United States likely would have entered a large-scale nuclear war.
(If...............and............) wrong

C. Russian lieutenant colonel Stanislav Petrov likely prevented a large-scale nuclear war between the United States and Russia on September 26, 1983 by correctly judging that the early warning system’s reports of an incoming nuclear missile were false, disobeying orders from his superiors to retaliate.
(disobeying is placed very far from the Stanislav Petrov, which it modifies)


D. On September 26, 1983, Russian lieutenant colonel Stanislav Petrov correctly judged that the early warning system’s reports of an incoming nuclear missile were false, disobeying orders from his superiors to retaliate and likely preventing the United States and Russia from entering a large-scale nuclear war.
(same as option C)

E. On September 26, 1983, Russian lieutenant colonel Stanislav Petrov likely prevented the United States and Russia from entering a large-scale nuclear war when he disobeyed orders from his superiors to retaliate and correctly judged that the early warning system’s reports that a nuclear missile was incoming were false.
( Can someone please explain how Option- E is wrong ? how the usage of the word " LIKELY" changes the meaning ? )
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AdityaHongunti
Had Russian lieutenant colonel Stanislav Petrov not correctly judged the early warning system’s reports of an incoming nuclear missile on September 26, 1983, to be false and disobeyed orders from his superiors to retaliate, Russia and the United States would likely have entered a large-scale nuclear war.


A. Had Russian lieutenant colonel Stanislav Petrov not correctly judged the early warning system’s reports of an incoming nuclear missile on September 26, 1983, to be false and disobeyed orders from his superiors to retaliate, Russia and the United States would likely have entered a large-scale nuclear war.
( this format of the sentence feels a little awkward though )

B. If Russian lieutenant colonel Stanislav Petrov had not correctly judged the early warning system that reported an incoming nuclear missile on September 26, 1983 to be false and then disobeyed orders from his superiors to retaliate, Russia and the United States likely would have entered a large-scale nuclear war.
(If...............and............) wrong

C. Russian lieutenant colonel Stanislav Petrov likely prevented a large-scale nuclear war between the United States and Russia on September 26, 1983 by correctly judging that the early warning system’s reports of an incoming nuclear missile were false, disobeying orders from his superiors to retaliate.
(disobeying is placed very far from the Stanislav Petrov, which it modifies)


D. On September 26, 1983, Russian lieutenant colonel Stanislav Petrov correctly judged that the early warning system’s reports of an incoming nuclear missile were false, disobeying orders from his superiors to retaliate and likely preventing the United States and Russia from entering a large-scale nuclear war.
(same as option C)

E. On September 26, 1983, Russian lieutenant colonel Stanislav Petrov likely prevented the United States and Russia from entering a large-scale nuclear war when he disobeyed orders from his superiors to retaliate and correctly judged that the early warning system’s reports that a nuclear missile was incoming were false.
( Can someone please explain how Option- E is wrong ? how the usage of the word " LIKELY" changes the meaning ? )


There is a subtle tense error in option E. If you understand the meaning then you'll know that the judgement happened earlier than the disobedience.. hence the placement of disobedience should be later than judgement.

The placement in option E makes the ans choice as if both the verbs are independent,making the answer choice incorrect.

We have to place the verb in such a way that there is clear sequencing

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A. Had Russian lieutenant colonel Stanislav Petrov not correctly judged the early warning system’s reports of an incoming nuclear missile on September 26, 1983, to be false and disobeyed orders from his superiors to retaliate, Russia and the United States would likely have entered a large-scale nuclear war.

Please explain the position of phrase-in-bold to understand the construction of sentence.
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A. Had Russian lieutenant colonel Stanislav Petrov not correctly judged the early warning system’s reports of an incoming nuclear missile on September 26, 1983, to be false and disobeyed orders from his superiors to retaliate, Russia and the United States would likely have entered a large-scale nuclear war.

Please explain the position of phrase-in-bold to understand the construction of sentence.

I don’t understand the use of the comma after 1983—it’s throwing me off completely. Can someone please explain? I can’t help but feel it’s an error, but it would be helpful to know whether this is a valid grammatical construct.

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I don’t understand the use of the comma after 1983—it’s throwing me off completely. Can someone please explain? I can’t help but feel it’s an error, but it would be helpful to know whether this is a valid grammatical construct.
This is a style issue.

1. September 26 1983
2. September 26, 1983
3. September 26, 1983, ← The comma after the year is dropped if there is a period immediately after it.

All of these are possible. The Chicago Manual of Style recommends (3), which is what is used in this question as well.

We don't need to worry about being tested on this though. Apart from things like comma splices, the GMAT is not really interested in testing the usage of commas. :)
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Dear experts,
mikemcgarry IanStewart VeritasKarishma daagh EMPOWERgmatVerbal EMPOWERgmatRichC DmitryFarber

In case of option A, I am unable to understand the timeline projected by the use of perfect tenses-
If we simplify the sentence, we can write it as - "had he not judged and had he not disobeyed - However, there is no marker for a subsequent action.

Can you please help me understand what is wrong in my understanding?
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Dear experts,
mikemcgarry IanStewart VeritasKarishma daagh EMPOWERgmatVerbal EMPOWERgmatRichC DmitryFarber

In case of option A, I am unable to understand the timeline projected by the use of perfect tenses-
If we simplify the sentence, we can write it as - "had he not judged and had he not disobeyed - However, there is no marker for a subsequent action.

Can you please help me understand what is wrong in my understanding?

We don't need a specific marker for subsequent action. It is obvious from context that he judged (correctly) and then, disobeyed orders. If he had not done this, something bad would have happened (hypothetical past)

If A and B had not happened, C would have happened.

Absolutely fine.
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Dear Friends,

Here is a detailed explanation to this question-

AdityaHongunti
Had Russian lieutenant colonel Stanislav Petrov not correctly judged the early warning system’s reports of an incoming nuclear missile on September 26, 1983, to be false and disobeyed orders from his superiors to retaliate, Russia and the United States would likely have entered a large-scale nuclear war.


A. Had Russian lieutenant colonel Stanislav Petrov not correctly judged the early warning system’s reports of an incoming nuclear missile on September 26, 1983, to be false and disobeyed orders from his superiors to retaliate, Russia and the United States would likely have entered a large-scale nuclear war.


B. If Russian lieutenant colonel Stanislav Petrov had not correctly judged the early warning system that reported an incoming nuclear missile on September 26, 1983 to be false and then disobeyed orders from his superiors to retaliate, Russia and the United States likely would have entered a large-scale nuclear war.


C. Russian lieutenant colonel Stanislav Petrov likely prevented a large-scale nuclear war between the United States and Russia on September 26, 1983 by correctly judging that the early warning system’s reports of an incoming nuclear missile were false, disobeying orders from his superiors to retaliate.


D. On September 26, 1983, Russian lieutenant colonel Stanislav Petrov correctly judged that the early warning system’s reports of an incoming nuclear missile were false, disobeying orders from his superiors to retaliate and likely preventing the United States and Russia from entering a large-scale nuclear war.


E. On September 26, 1983, Russian lieutenant colonel Stanislav Petrov likely prevented the United States and Russia from entering a large-scale nuclear war when he disobeyed orders from his superiors to retaliate and correctly judged that the early warning system’s reports that a nuclear missile was incoming were false.

Choice A: Option A conveys the intended meaning of the sentence. Thus, Option A is correct.

Choice B: Option B changes the meaning of this sentence; the intended meaning of the sentence is that Petrov judged the reports produced by the early warning system, but Option B implies that Petrov judged the system itself. Thus, Option B is incorrect.

Choice C: In Option C we see a meaning error caused by the phrase "disobeying orders from his superiors to retaliate."; this phrase modifies "correctly judging that the early warning system’s reports of an incoming nuclear missile were false", implying that Petrov disobeyed his superiors to judge the reports. This construction reverses the correct course of events, wherein Petrov judged the reports to be incorrect and then disobeyed further orders from his superiors. Thus, Option C is incorrect.

Choice D: Option D repeats the modifier errors committed by Option C. Furthermore, Option D also incorrectly links "preventing large-scale nuclear war..." to the action of judging the reports rather than "disobeying orders to retaliate"; in this manner, Option D further distorts the intended meaning of the sentence. Thus, Option D is incorrect.

Choice E: Option E alters the intended meaning of the sentence by reversing the order of clauses; this answer choice incorrectly implies that Petrov's judgment of the reports occurred after he disobeyed orders. Thus, Option E is incorrect.

Hence, A is the best answer choice.

It should be noted here that, in such a sentence we do not require specific markers for subsequent actions, as it is clear from the context what the order of events is.

All the best!
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I do not think A is well structured, for the fact that the word 'disobeyed' can also act as an adjective. In fact, at first glance, I thought that the orders were " false and disobeyed" . Moreover it sounds like Had Russian lieutenant colonel Stanislav Petrov not correctly judged the early warning system’s reports of an incoming nuclear missile on September 26, 1983, to be false and disobeyed orders from his superiors to retaliate to be separate indications. I do not think GMAT is going to throw something that is so unclear.
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AdityaHongunti
1) Take a First Glance (5 seconds)

The underline encompasses the entire long sentence, so pay careful attention to the Sentence Structure and watch out for any misplaced Modifiers. Had and if indicate a hypothetical, so make sure that the Verbs match.



(2) Read for Meaning

The sentence theorizes that when Stanislav Petrov decided that Russia’s early warning system’s reports of an incoming missile were incorrect and therefore disobeyed his superiors’ orders to retaliate, he likely prevented a nuclear war between Russia and the United States. Would likely have is the correct construction for this hypothetical. If you can’t spot a mistake in the original sentence, reserve judgment on answer choice (A). Since the entire sentence is underlined, it will be difficult to compare answers vertically to find splits. Read each answer on its own, and when you spot an error, investigate the remaining answers and eliminate any that make the same mistake.



(3) Find a Starting Point

Start with any difference that seems easiest to you, then move to the next easiest issue, and so on. Stop when you have one answer or you aren’t sure how to address the remaining differences. All errors for each choice are detailed in the next section.



(4) Eliminate (and Repeat)

(A) CORRECT. This sentence correctly says that Petrov judged the early warning system’s reports (rather than the system itself) to be false. The sequence of events is in the correct order.

(B) In the original sentence, Petrov judged the early warning system’s reports … to be false. This answer, however, says that Petrov judged the early warning system … to be false. The reports were false, not the system itself.

(C) A comma –ing modifier modifies the main subject and verb, so in this choice, disobeying is modifying Petrov likely prevented. However, it is not the case that the fact that Petrov prevented the war resulted in his decision to disobey his superiors. The reverse construction would make sense: Petrov disobeyed orders from his superiors, likely preventing a nuclear war.

(D) A comma –ing modifier modifies the main subject and verb, Petrov correctly judged. However, disobeying does not describe how Petrov correctly judged … the reports … to be false. In addition, the modifier preventing also points back to Petrov correctly judged, but judging the reports to be incorrect isn’t what prevented nuclear war; rather, disobeying orders from his superiors to retaliate is what prevented nuclear war, so preventing ought to modify disobeying.

(E) This sentence says that Petrov did two things: disobeyed orders from his superiors to retaliate and correctly judged the reports to be false. The second action (judging the reports to be false) necessarily occurred before the first (disobeying orders from his superiors to retaliate) Since judging the reports to be false led directly to disobeying Petrov’s superiors’ orders, the order of these two clauses should be reversed.

hibobotamuss if you need more thorough explanation then lemme know

I do not think A is well structured, for the fact that the word 'disobeyed' can also act as an adjective. In fact, at first glance, I thought that the orders were " false and disobeyed" . Moreover it sounds like Had Russian lieutenant colonel Stanislav Petrov not correctly judged the early warning system’s reports of an incoming nuclear missile on September 26, 1983, to be false and disobeyed orders from his superiors to retaliate to be separate indications. I do not think GMAT is going to throw something that is so unclear.
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aniket16c
Dear experts,
mikemcgarry IanStewart VeritasKarishma daagh EMPOWERgmatVerbal EMPOWERgmatRichC DmitryFarber

In case of option A, I am unable to understand the timeline projected by the use of perfect tenses-
If we simplify the sentence, we can write it as - "had he not judged and had he not disobeyed - However, there is no marker for a subsequent action.

Can you please help me understand what is wrong in my understanding?

We don't need a specific marker for subsequent action. It is obvious from context that he judged (correctly) and then, disobeyed orders. If he had not done this, something bad would have happened (hypothetical past)

If A and B had not happened, C would have happened.

Absolutely fine.

Would the same structure hold in case there would not be a hypothetical past but a hypothetical present

For eg: Had I studied, I would be rich today. ?

Or would the use of past perfect be wrong as there is no past action coming after it ?
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Hi VeritasKarishma MartyTargetTestPrep IanStewart - this is a manhattan question so I am always weary but i thought option A was wrong becuse of its initial modifier (highlighted in green in my picture of option A)

I thought in option A - the inital modifer in green DID NOT modify the subject (Russia and USA) specifically.

In other official question like here -- the initial modifier HAS TO MODIFY the subject specifically and has been the basis for elimination.

HAD is after-all a VERB-ED modifier (i think - but i could be wrong)
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jabhatta2
i thought option A was wrong becuse of its initial modifier (highlighted in green in my picture of option A)

That isn't a modifier; it's a conditional clause. It's like in the sentence "If you study for the GMAT, your score will improve", the first half of the sentence is not a modifier. It's a conditional clause, stating the condition under which the main clause is true.
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AdityaHongunti
Had Russian lieutenant colonel Stanislav Petrov not correctly judged the early warning system’s reports of an incoming nuclear missile on September 26, 1983, to be false and disobeyed orders from his superiors to retaliate, Russia and the United States would likely have entered a large-scale nuclear war.


A. Had Russian lieutenant colonel Stanislav Petrov not correctly judged the early warning system’s reports of an incoming nuclear missile on September 26, 1983, to be false and disobeyed orders from his superiors to retaliate, Russia and the United States would likely have entered a large-scale nuclear war.

B. If Russian lieutenant colonel Stanislav Petrov had not correctly judged the early warning system that reported an incoming nuclear missile on September 26, 1983 to be false and then disobeyed orders from his superiors to retaliate, Russia and the United States likely would have entered a large-scale nuclear war.

C. Russian lieutenant colonel Stanislav Petrov likely prevented a large-scale nuclear war between the United States and Russia on September 26, 1983 by correctly judging that the early warning system’s reports of an incoming nuclear missile were false, disobeying orders from his superiors to retaliate.

D. On September 26, 1983, Russian lieutenant colonel Stanislav Petrov correctly judged that the early warning system’s reports of an incoming nuclear missile were false, disobeying orders from his superiors to retaliate and likely preventing the United States and Russia from entering a large-scale nuclear war.

E. On September 26, 1983, Russian lieutenant colonel Stanislav Petrov likely prevented the United States and Russia from entering a large-scale nuclear war when he disobeyed orders from his superiors to retaliate and correctly judged that the early warning system’s reports that a nuclear missile was incoming were false.


We have a conditional here: "If A had not done this, B would have done that."
We normally make it concise like this: "Had A not done this, B would have done that."

The basic structure of option (A) is the same:
Had SP not correctly judged reports to be false and disobeyed orders, Russia and US would have entered a nuclear war.

Hence, the correct answer is (A)

B. If Russian lieutenant colonel Stanislav Petrov had not correctly judged the early warning system that reported an incoming nuclear missile on September 26, 1983 to be false and then disobeyed orders from his superiors to retaliate, Russia and the United States likely would have entered a large-scale nuclear war.

See the highlighted part: SP did not judge the warning system to be false. He judged the report of the warning system to be false.
This option implies that SP judged the warning system to be false. The 'that' clause 'that reported an ...' modifies the warning system.
So this is incorrect.


C. Russian lieutenant colonel Stanislav Petrov likely prevented a large-scale nuclear war between the United States and Russia on September 26, 1983 by correctly judging that the early warning system’s reports of an incoming nuclear missile were false, disobeying orders from his superiors to retaliate.

D. On September 26, 1983, Russian lieutenant colonel Stanislav Petrov correctly judged that the early warning system’s reports of an incoming nuclear missile were false, disobeying orders from his superiors to retaliate and likely preventing the United States and Russia from entering a large-scale nuclear war.

E. On September 26, 1983, Russian lieutenant colonel Stanislav Petrov likely prevented the United States and Russia from entering a large-scale nuclear war when he disobeyed orders from his superiors to retaliate and correctly judged that the early warning system’s reports that a nuclear missile was incoming were false.


SP did two things - judged the report to be false and then disobeyed orders.
The two elements "judged" and "disobeyed" should be parallel. Also, "judged..." should come before "disobeyed..." because he first judged and then disobeyed.
"disobeying orders" is not the natural effect of "judging the report to be incorrect". The two actions were performed by SP intentionally. Whatever may have been his judgement, he may still have obeyed orders.
Hence the use of comma + verb-ing is not correct as done in (C) and (D).
In (E), he disobeyed orders and judged reports to be false. The sequence is switched.
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jabhatta2
Hi VeritasKarishma MartyTargetTestPrep IanStewart - this is a manhattan question so I am always weary but i thought option A was wrong becuse of its initial modifier (highlighted in green in my picture of option A)

I thought in option A - the inital modifer in green DID NOT modify the subject (Russia and USA) specifically.

In other official question like here -- the initial modifier HAS TO MODIFY the subject specifically and has been the basis for elimination.

HAD is after-all a VERB-ED modifier (i think - but i could be wrong)

Hello jabhatta2,

We hope this finds you well.

Having gone through the question and your query, we believe we can resolve your doubt.

As IanStewart has written, the first portion of this sentence is not a noun modifier; it is a conditional clause, a dependent clause that establishes a condition upon which the following clause depends. Thus, "Had Russian lieutenant colonel...to retaliate" acts upon the entire clause "Russia and the United States would likely have entered a large-scale nuclear war" rather than on just the noun phrase "Russia and the United States". Conditional clauses can often be identified through their use of wishful triggers, such as "if" and "had".

We hope this helps.
All the best!
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VeritasKarishma

The two elements "judged" and "disobeyed" should be parallel. Also, "judged..." should come before "disobeyed..." because he first judged and then disobeyed.
"disobeying orders" is not the natural effect of "judging the report to be incorrect". The two actions were performed by SP intentionally. Whatever may have been his judgement, he may still have obeyed orders.
Hence the use of comma + verb-ing is not correct as done in (C) and (D).
In (E), he disobeyed orders and judged reports to be false. The sequence is switched.

Hi VeritasKarishma - Per the yellow highlight above, how are you so sure that SP first "judged the report to be incorrect" and THEN "disobeyed orders from his seniors to retaliate" ?

I personally thought one cannot be sure regarding the sequence of events.

Maybe he first "disobeyed orders" and then subsequently "judged the report to be incorrect"

Is it because of the prepositional phrase "TO RETALIATE" that you are making this assumption regarding the sequence of events.

If the prepositional phrase "TO RETALIATE was removed, you would not make the assumption in yellow perhaps ?

Thank you
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jabhatta2
VeritasKarishma

The two elements "judged" and "disobeyed" should be parallel. Also, "judged..." should come before "disobeyed..." because he first judged and then disobeyed.
"disobeying orders" is not the natural effect of "judging the report to be incorrect". The two actions were performed by SP intentionally. Whatever may have been his judgement, he may still have obeyed orders.
Hence the use of comma + verb-ing is not correct as done in (C) and (D).
In (E), he disobeyed orders and judged reports to be false. The sequence is switched.

Hi VeritasKarishma - Per the yellow highlight above, how are you so sure that SP first "judged the report to be incorrect" and THEN "disobeyed orders from his seniors to retaliate" ?

I personally thought one cannot be sure regarding the sequence of events.

Maybe he first "disobeyed orders" and then subsequently "judged the report to be incorrect"

Is it because of the prepositional phrase "TO RETALIATE" that you are making this assumption regarding the sequence of events.

If the prepositional phrase "TO RETALIATE was removed, you would not make the assumption in yellow perhaps ?

Thank you

It is logical that he would judge the report to be false and that is why refuse to obey orders to retaliate. There has to be some conviction of his own which would make him disobey orders. Disobeying orders is certainly not routine for men in uniform and it is their job to defend and/or retaliate.
"to retaliate" helps us understand which orders we are talking about and that the orders were the ones related to retaliating the supposed nuclear attack.
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