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Comcorp Shipping Clerk: Last week, no shipments of building supplies

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Comcorp Shipping Clerk: Last week, no shipments of building supplies [#permalink]

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Source : GMATPrep Default Exam Pack

Comcorp Shipping Clerk: Last week, no shipments of building supplies were sent out on Friday. The five specially ordered shipments sent out last week were sent out on Thursday, and each of those specially ordered shipments consisted entirely of building supplies. Four shipments were sent to Truax Construction last week, none of which consisted of building supplies.

If the shipping clerk's statements are true, which of the following must also be true?

(A) All of Comcorp's shipments of building supplies last week were specially ordered.

(B) None of Comcorp's shipments sent on friday of last week was sent to Truax Construction.

(C) None of the shipments sent by Comcorp by Truax Construction last week was specially ordered.

(D) None of Comcorp's shipments sent on Thursday of last week was sent to Truax Construction.

(E) All of Comcorp's shipments of building supplies last week were sent out on Thursday.
[Reveal] Spoiler: OA

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Last edited by hazelnut on 26 Oct 2017, 06:06, edited 2 times in total.
Edited the question.

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Re: Comcorp Shipping Clerk: Last week, no shipments of building supplies [#permalink]

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This is an inference question. We are given a series of facts, and then asked to draw an inference. On inference questions, the bar is very high -> the correct answer must 100% without a doubt be true.

Comcorp Shipping Clerk: Last week, no shipments of building supplies were sent out on friday. The five specially ordered shipments sent out last week were sent out on Thursday, and each of those specially ordered shipments consisted entirely of building supplies. Four shipments were sent to Truax Construction last week, none of which consisted of building supplies.

If the shipping clerk's statements are true, which of the following must also be true?

a. All of Comcorp's shipments of building supplies last week were specially ordered.
We know that all of the specially ordered shipments contain building supplies, but some others could have contained building supplies as well. Do not reverse the argument!

b. None of Comcorp's shipments sent on friday of last week was sent to Truax Construction.
None of the specially ordered shipments were sent out on Friday, but we know that the shipments sent to Truax were all non-specially ordered (because they contained no building supplies). These could have been sent on any day, we have no idea.

c. None of the shipments sent by Comcorp by Truax Construction last week was specially ordered.
If all of the specially ordered shipments contained building supplies, and none of the shipments to Truax contained building supplies, then it is 100% certain that none of the shipments sent to Truax was specially ordered. Our 100% bar truth has been reached!

d. None of Comcorp's shipments sent on thursday of last week was sent to Truax Construction.
We have no idea what day the shipments to Truax were sent. All specially ordered shipments were sent on Thursday, but we have no limit on when the non-specially ordered shipments were sent.

e. All of Comcorp's shipments of building supplies last week were sent out on thursday.
Similar to answer choice a, it is possible that building supplies were also included in non-specially ordered shipments, and these could have been sent on another day.

I hope this helps!
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Re: Comcorp Shipping Clerk: Last week, no shipments of building supplies [#permalink]

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New post 10 Jun 2015, 03:40
VeritasPrepBrandon wrote:
This is an inference question. We are given a series of facts, and then asked to draw an inference. On inference questions, the bar is very high -> the correct answer must 100% without a doubt be true.

Comcorp Shipping Clerk: Last week, no shipments of building supplies were sent out on friday. The five specially ordered shipments sent out last week were sent out on Thursday, and each of those specially ordered shipments consisted entirely of building supplies. Four shipments were sent to Truax Construction last week, none of which consisted of building supplies.

If the shipping clerk's statements are true, which of the following must also be true?

a. All of Comcorp's shipments of building supplies last week were specially ordered.
We know that all of the specially ordered shipments contain building supplies, but some others could have contained building supplies as well. Do not reverse the argument!

b. None of Comcorp's shipments sent on friday of last week was sent to Truax Construction.
None of the specially ordered shipments were sent out on Friday, but we know that the shipments sent to Truax were all non-specially ordered (because they contained no building supplies). These could have been sent on any day, we have no idea.

c. None of the shipments sent by Comcorp by Truax Construction last week was specially ordered.
If all of the specially ordered shipments contained building supplies, and none of the shipments to Truax contained building supplies, then it is 100% certain that none of the shipments sent to Truax was specially ordered. Our 100% bar truth has been reached!

d. None of Comcorp's shipments sent on thursday of last week was sent to Truax Construction.
We have no idea what day the shipments to Truax were sent. All specially ordered shipments were sent on Thursday, but we have no limit on when the non-specially ordered shipments were sent.

e. All of Comcorp's shipments of building supplies last week were sent out on thursday.
Similar to answer choice a, it is possible that building supplies were also included in non-specially ordered shipments, and these could have been sent on another day.

I hope this helps!



Went for C which looks better than D. However, the statement states that 'The five specially ordered shipments sent out last week were sent out on Thursday, and each of those specially ordered shipments consisted entirely of building supplies.'
Here, each of those explicitly states that only out of those specially ordered shipments which were sent on Thursday consisted of building supplies. It is nowhere mentioned that only 5 specially ordered shipments were there. There could be more than 5 specially ordered shipments and one of them might have been sent to Truax containing not building supplies but something else like vegetables supplies.

IMO none of the options can be 100% true from the given information.

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Re: Comcorp Shipping Clerk: Last week, no shipments of building supplies [#permalink]

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swappatil123 wrote:
VeritasPrepBrandon wrote:
This is an inference question. We are given a series of facts, and then asked to draw an inference. On inference questions, the bar is very high -> the correct answer must 100% without a doubt be true.

Comcorp Shipping Clerk: Last week, no shipments of building supplies were sent out on friday. The five specially ordered shipments sent out last week were sent out on Thursday, and each of those specially ordered shipments consisted entirely of building supplies. Four shipments were sent to Truax Construction last week, none of which consisted of building supplies.

If the shipping clerk's statements are true, which of the following must also be true?

a. All of Comcorp's shipments of building supplies last week were specially ordered.
We know that all of the specially ordered shipments contain building supplies, but some others could have contained building supplies as well. Do not reverse the argument!

b. None of Comcorp's shipments sent on friday of last week was sent to Truax Construction.
None of the specially ordered shipments were sent out on Friday, but we know that the shipments sent to Truax were all non-specially ordered (because they contained no building supplies). These could have been sent on any day, we have no idea.

c. None of the shipments sent by Comcorp by Truax Construction last week was specially ordered.
If all of the specially ordered shipments contained building supplies, and none of the shipments to Truax contained building supplies, then it is 100% certain that none of the shipments sent to Truax was specially ordered. Our 100% bar truth has been reached!

d. None of Comcorp's shipments sent on thursday of last week was sent to Truax Construction.
We have no idea what day the shipments to Truax were sent. All specially ordered shipments were sent on Thursday, but we have no limit on when the non-specially ordered shipments were sent.

e. All of Comcorp's shipments of building supplies last week were sent out on thursday.
Similar to answer choice a, it is possible that building supplies were also included in non-specially ordered shipments, and these could have been sent on another day.

I hope this helps!



Went for C which looks better than D. However, the statement states that 'The five specially ordered shipments sent out last week were sent out on Thursday, and each of those specially ordered shipments consisted entirely of building supplies.'
Here, each of those explicitly states that only out of those specially ordered shipments which were sent on Thursday consisted of building supplies. It is nowhere mentioned that only 5 specially ordered shipments were there. There could be more than 5 specially ordered shipments and one of them might have been sent to Truax containing not building supplies but something else like vegetables supplies.

IMO none of the options can be 100% true from the given information.


Hello swappatil123
But in argument present an emphasis on last week:
"The five specially ordered shipments sent out last week (and further it's additional information about these orders) were sent out on Thursday"

So I think from this part we can infer that on this week were only 5 special ordered shipments.

And in case that you describe I think phrase will be sound like:
"The five specially ordered shipments that were sent out last week on Thursday"
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Re: Comcorp Shipping Clerk: Last week, no shipments of building supplies [#permalink]

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New post 24 Apr 2017, 21:47
Can anyone please explain how to conclude/infer that there is no special order among these 4 shipments to Truax Construction.
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Re: Comcorp Shipping Clerk: Last week, no shipments of building supplies [#permalink]

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New post 03 Jul 2017, 08:42
nahid78 wrote:
Can anyone please explain how to conclude/infer that there is no special order among these 4 shipments to Truax Construction.


Comcorp Shipping Clerk: Last week, no shipments of building supplies were sent out on friday.
The five specially ordered shipments sent out last week were sent out on Thursday, and each of those specially ordered shipments consisted entirely of building supplies. - This states that last week only 5 special orders were sent and that they were sent on Thursday and that they did not contain BS
Four shipments were sent to Truax Construction last week, none of which consisted of building supplies. - This states that whatever was shipped to T did not contain BS

Hence, we can say that no special orders were sent to T

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Re: Comcorp Shipping Clerk: Last week, no shipments of building supplies [#permalink]

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New post 04 Jul 2017, 10:17
Hi Experts please explain why option D is wrong
And how to tackle such questions in general.
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Re: Comcorp Shipping Clerk: Last week, no shipments of building supplies [#permalink]

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New post 04 Jul 2017, 23:08
The following information has been given in the argument :
1. No shipments(containing BS) - sent out on Friday
2. 5 of the shipments sent on Thursday were Specially Ordered(Contained BS)
3. 4 shipments to Traux Constructions (didn't contain BS)
where BS - building supplies

So we can decipher the following things
1. Of the 5 specially ordered shipments, 4 were sent on Thursday.
2. Comcorp had sent at the bare minimum of 5 shipments during that week(that contained BS)
3. The maximum number of shipments has not been explicitly mentioned in the argument.

Only Option C(None of the shipments sent by Comcorp by Truax Construction last week was specially ordered)
is clearly true because Traux Construction didn't order any BS that week(and all specially ordered packages contained BS only)

As for Option D,
Concor could have sent some shipments on Thursday which were not specially ordered.
Since Traux Construction had ordered shipments which were not specially order, it is possible
that they had received those packages
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Re: Comcorp Shipping Clerk: Last week, no shipments of building supplies [#permalink]

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New post 14 Jul 2017, 21:18
A+ question, does anyone have any advice on how best to keep track of all the info in the Q on test day (e.g., what's most effective to jot down on my notepad)?

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Re: Comcorp Shipping Clerk: Last week, no shipments of building supplies [#permalink]

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New post 16 Sep 2017, 07:55
Harley1980 wrote:
swappatil123 wrote:
VeritasPrepBrandon wrote:
This is an inference question. We are given a series of facts, and then asked to draw an inference. On inference questions, the bar is very high -> the correct answer must 100% without a doubt be true.

Comcorp Shipping Clerk: Last week, no shipments of building supplies were sent out on friday. The five specially ordered shipments sent out last week were sent out on Thursday, and each of those specially ordered shipments consisted entirely of building supplies. Four shipments were sent to Truax Construction last week, none of which consisted of building supplies.

If the shipping clerk's statements are true, which of the following must also be true?

a. All of Comcorp's shipments of building supplies last week were specially ordered.
We know that all of the specially ordered shipments contain building supplies, but some others could have contained building supplies as well. Do not reverse the argument!

b. None of Comcorp's shipments sent on friday of last week was sent to Truax Construction.
None of the specially ordered shipments were sent out on Friday, but we know that the shipments sent to Truax were all non-specially ordered (because they contained no building supplies). These could have been sent on any day, we have no idea.

c. None of the shipments sent by Comcorp by Truax Construction last week was specially ordered.
If all of the specially ordered shipments contained building supplies, and none of the shipments to Truax contained building supplies, then it is 100% certain that none of the shipments sent to Truax was specially ordered. Our 100% bar truth has been reached!

d. None of Comcorp's shipments sent on thursday of last week was sent to Truax Construction.
We have no idea what day the shipments to Truax were sent. All specially ordered shipments were sent on Thursday, but we have no limit on when the non-specially ordered shipments were sent.

e. All of Comcorp's shipments of building supplies last week were sent out on thursday.
Similar to answer choice a, it is possible that building supplies were also included in non-specially ordered shipments, and these could have been sent on another day.

I hope this helps!



Went for C which looks better than D. However, the statement states that 'The five specially ordered shipments sent out last week were sent out on Thursday, and each of those specially ordered shipments consisted entirely of building supplies.'
Here, each of those explicitly states that only out of those specially ordered shipments which were sent on Thursday consisted of building supplies. It is nowhere mentioned that only 5 specially ordered shipments were there. There could be more than 5 specially ordered shipments and one of them might have been sent to Truax containing not building supplies but something else like vegetables supplies.

IMO none of the options can be 100% true from the given information.


Hello swappatil123
But in argument present an emphasis on last week:
"The five specially ordered shipments sent out last week (and further it's additional information about these orders) were sent out on Thursday"

So I think from this part we can infer that on this week were only 5 special ordered shipments.

And in case that you describe I think phrase will be sound like:
"The five specially ordered shipments that were sent out last week on Thursday"




I also think that we can not conclude that the five specially ordered shipments sent out on Thursday were the only specially ordered shipments sent out that week. If the latter was true the author should not have used "the". Moreover, the sentence could be written like this : "Of the shipments sent out last week five were specially ordered"

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Re: Comcorp Shipping Clerk: Last week, no shipments of building supplies [#permalink]

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New post 26 Oct 2017, 05:58
GMATNinja, Could you help to explain? Why (D) is wrong?

Comcorp Shipping Clerk: Last week, no shipments of building supplies were sent out on friday. The five specially ordered shipments sent out last week were sent out on Thursday, and each of those specially ordered shipments consisted entirely of building supplies. Four shipments were sent to Truax Construction last week, none of which consisted of building supplies.

If the shipping clerk's statements are true, which of the following must also be true?

(A) All of Comcorp's shipments of building supplies last week were specially ordered.

(B) None of Comcorp's shipments sent on friday of last week was sent to Truax Construction.

(C) None of the shipments sent by Comcorp by Truax Construction last week was specially ordered.

(D) None of Comcorp's shipments sent on Thursday of last week was sent to Truax Construction.

(E) All of Comcorp's shipments of building supplies last week were sent out on Thursday.
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Re: Comcorp Shipping Clerk: Last week, no shipments of building supplies [#permalink]

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New post 26 Oct 2017, 09:59
It really throws you off, when you see typos in the questions.

I disregarded option C only because of "sent by Comcorp by Truax" phrase here, instead of "sent by Comcorp to Truax.

"(C) None of the shipments sent by Comcorp by Truax Construction last week was specially ordered." This sentence is just plain wrong.

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Re: Comcorp Shipping Clerk: Last week, no shipments of building supplies [#permalink]

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New post 01 Nov 2017, 13:35
hazelnut wrote:
GMATNinja, Could you help to explain? Why (D) is wrong?

Comcorp Shipping Clerk: Last week, no shipments of building supplies were sent out on friday. The five specially ordered shipments sent out last week were sent out on Thursday, and each of those specially ordered shipments consisted entirely of building supplies. Four shipments were sent to Truax Construction last week, none of which consisted of building supplies.

If the shipping clerk's statements are true, which of the following must also be true?

(A) All of Comcorp's shipments of building supplies last week were specially ordered.

(B) None of Comcorp's shipments sent on friday of last week was sent to Truax Construction.

(C) None of the shipments sent by Comcorp by Truax Construction last week was specially ordered.

(D) None of Comcorp's shipments sent on Thursday of last week was sent to Truax Construction.

(E) All of Comcorp's shipments of building supplies last week were sent out on Thursday.

Truax did not receive any building supplies, and that means that Truax did not receive any of the SPECIALLY ordered shipments sent on Thursday. But, on Thursday, Comcorp may have sent Truax a shipment that was NOT specially ordered.
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Re: Comcorp Shipping Clerk: Last week, no shipments of building supplies [#permalink]

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New post 03 Dec 2017, 19:53
If 5 shipments all had building supplies and were all specially ordered then,

4 were sent to TC on Mon, Tues or Wed because:
- none had building supplies
- none were specially ordered
- each shipment sent on Thursday had building supplies
- Friday = 0

'THE five specially ordered shipments sent...' means there were a total of 5
'Five specially ordered shipments sent...' means there is at least 5 shipments

If the above is true, then C and D should be both correct; since it is not, I must be missing something.


Harley1980 wrote:
Source : GMATPrep Default Exam Pack

Comcorp Shipping Clerk: Last week, no shipments of building supplies were sent out on Friday. The five specially ordered shipments sent out last week were sent out on Thursday, and each of those specially ordered shipments consisted entirely of building supplies. Four shipments were sent to Truax Construction last week, none of which consisted of building supplies.

If the shipping clerk's statements are true, which of the following must also be true?

(A) All of Comcorp's shipments of building supplies last week were specially ordered.

(B) None of Comcorp's shipments sent on friday of last week was sent to Truax Construction.

(C) None of the shipments sent by Comcorp by Truax Construction last week was specially ordered.

(D) None of Comcorp's shipments sent on Thursday of last week was sent to Truax Construction.

(E) All of Comcorp's shipments of building supplies last week were sent out on Thursday.

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Re: Comcorp Shipping Clerk: Last week, no shipments of building supplies [#permalink]

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mrdlee23 wrote:
If 5 shipments all had building supplies and were all specially ordered then,

4 were sent to TC on Mon, Tues or Wed because:
- none had building supplies
- none were specially ordered
- each shipment sent on Thursday had building supplies
- Friday = 0

'THE five specially ordered shipments sent...' means there were a total of 5
'Five specially ordered shipments sent...' means there is at least 5 shipments

If the above is true, then C and D should be both correct; since it is not, I must be missing something.

See if this explanation helps!
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Re: Comcorp Shipping Clerk: Last week, no shipments of building supplies [#permalink]

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New post 06 Dec 2017, 05:53
Harley1980 wrote:
Source : GMATPrep Default Exam Pack

Comcorp Shipping Clerk: Last week, no shipments of building supplies were sent out on Friday. The five specially ordered shipments sent out last week were sent out on Thursday, and each of those specially ordered shipments consisted entirely of building supplies. Four shipments were sent to Truax Construction last week, none of which consisted of building supplies.

If the shipping clerk's statements are true, which of the following must also be true?

(A) All of Comcorp's shipments of building supplies last week were specially ordered.

(B) None of Comcorp's shipments sent on friday of last week was sent to Truax Construction.

(C) None of the shipments sent by Comcorp by Truax Construction last week was specially ordered.

(D) None of Comcorp's shipments sent on Thursday of last week was sent to Truax Construction.

(E) All of Comcorp's shipments of building supplies last week were sent out on Thursday.


I thought this was tricky and am not sure that I used the correct logic to get to the right answer.
Key info from passage:
Friday-no building supply shipments
Thursday- five specialty orders of building supplies were sent out
Four shipments were sent to Truax and none of these four shipments contained building supplies

From this we only have information about Thursday and Friday, the specialty orders and that Truax did not order building supplies

(A) All of Comcorp's shipments of building supplies last week were specially ordered.
This statement inverts the argument-we know that all specialty orders contained building supplies but there is no information in the passage to tell us that other orders didn't have building supplies in them

(B) None of Comcorp's shipments sent on friday of last week was sent to Truax Construction.
We know that Truax didn't get any building supplies or specialty orders so based on the statement their shipments could have been sent on Friday

(C) None of the shipments sent by Comcorp by Truax Construction last week was specially ordered.
We know that all specialty orders had building supplies and that Truax didn't order any building supplies so this statement is correct

(D) None of Comcorp's shipments sent on Thursday of last week was sent to Truax Construction.
We know that specialty orders were sent on Thursday but we don't have any other information about other orders that may have been sent on Thursday or information that tells us only specialty orders were sent on Thursday.

(E) All of Comcorp's shipments of building supplies last week were sent out on Thursday.
We are only give information that specialty orders had building supplies but other orders could have contained and been sent on different days since the prompt does not give parameters telling us otherwise

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Re: Comcorp Shipping Clerk: Last week, no shipments of building supplies   [#permalink] 06 Dec 2017, 05:53
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