Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized for You

we will pick new questions that match your level based on your Timer History

Track Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

It appears that you are browsing the GMAT Club forum unregistered!

Signing up is free, quick, and confidential.
Join other 500,000 members and get the full benefits of GMAT Club

Registration gives you:

Tests

Take 11 tests and quizzes from GMAT Club and leading GMAT prep companies such as Manhattan GMAT,
Knewton, and others. All are free for GMAT Club members.

Applicant Stats

View detailed applicant stats such as GPA, GMAT score, work experience, location, application
status, and more

Books/Downloads

Download thousands of study notes,
question collections, GMAT Club’s
Grammar and Math books.
All are free!

Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:

For a certain set of numbers, if x is in the set, then x - 3 [#permalink]

Show Tags

30 Jul 2012, 07:45

3

This post was BOOKMARKED

00:00

A

B

C

D

E

Difficulty:

15% (low)

Question Stats:

70% (01:36) correct
30% (00:49) wrong based on 256 sessions

HideShow timer Statictics

For a certain set of numbers, if x is in the set, then x - 3 is also in the set. If the number 1 is in the set , which of the following must also be in the set ?

a) 4 b) -1 c) -5

A. a only, B. b only, C. c only, D. a and b only E. b and c only

I need to know why can't x-3 = 1 be considered? if yes then x = 4 (which is not the answer )

Re: For a certain set of numbers, if x is in the set, then x - 3 [#permalink]

Show Tags

30 Jul 2012, 08:02

5

This post received KUDOS

Expert's post

1

This post was BOOKMARKED

jayoptimist wrote:

For a certain set of numbers, if x is in the set, then x - 3 is also in the set. If the number 1 is in the set , which of the following must also be in the set ?

a) 4 b) -1 c) -5

A. a only, B. b only, C. c only, D. a and b only E. b and c only

I need to know why can't x-3 = 1 be considered? if yes then x = 4 (which is not the answer )

Notice that the question asks which of the following MUST be in the set, not COULD be in the set.

Since 1 is in the set, then so must be 1-3=-2. Similarly, since -2 is in the set, then so must be -2-3=-5. Could 4 and -1 be in the set? Certainly, but we don't know that for sure.

Answer: C.

Regarding your question: we don't know which is the source integer in the set, if it's 1, then 4 won't be in the set but if the source integer is say 7, then 4 will be in the set. So, 4 may or may not be in the set.

For a certain set of numbers, if x is in the set, x-3 is als [#permalink]

Show Tags

30 Dec 2012, 17:22

For a certain set of numbers, if x is in the set, x-3 is also in the set. If the number 1 is in the set, which of the following must also be in the set I) 4 II) -1 III) -5

the answer is III only, means -5.

They are reasoning that, 1 in the set, so -2 also in the set, so -5 also in the set, so -8 also in the set.

I wonder why 4 can't be in the set??? let consider 1 is x-3, not x, hence x = 4. What is the trap of GMAT here?

Re: For a certain set of numbers, if x is in the set, x-3 is als [#permalink]

Show Tags

30 Dec 2012, 21:40

2

This post received KUDOS

akhandamandala wrote:

For a certain set of numbers, if x is in the set, x-3 is also in the set. If the number 1 is in the set, which of the following must also be in the set I) 4 II) -1 III) -5

the answer is III only, means -5.

They are reasoning that, 1 in the set, so -2 also in the set, so -5 also in the set, so -8 also in the set.

I wonder why 4 can't be in the set??? let consider 1 is x-3, not x, hence x = 4. What is the trap of GMAT here?

(I always have problem with the trap of gmat)

We can look at this as a cause and effect problem. "x" is the cause and "x-3" is the effect. i.e. We are given that is "x" is in the set "x-3" is also in the set. The reverse need not necessarily be true. We cannot take the effect to be the cause. _________________

Did you find this post helpful?... Please let me know through the Kudos button.

Re: For a certain set of numbers, if x is in the set, x-3 is als [#permalink]

Show Tags

31 Dec 2012, 03:06

Expert's post

akhandamandala wrote:

For a certain set of numbers, if x is in the set, x-3 is also in the set. If the number 1 is in the set, which of the following must also be in the set I) 4 II) -1 III) -5

the answer is III only, means -5.

They are reasoning that, 1 in the set, so -2 also in the set, so -5 also in the set, so -8 also in the set.

I wonder why 4 can't be in the set??? let consider 1 is x-3, not x, hence x = 4. What is the trap of GMAT here?

(I always have problem with the trap of gmat)

Merging similar topics. Please refer to the solutions above. _________________

Re: For a certain set of numbers, if x is in the set, then x - 3 [#permalink]

Show Tags

31 Dec 2012, 12:21

1

This post received KUDOS

jayoptimist wrote:

For a certain set of numbers, if x is in the set, then x - 3 is also in the set. If the number 1 is in the set , which of the following must also be in the set ?

a) 4 b) -1 c) -5

A. a only, B. b only, C. c only, D. a and b only E. b and c only

I need to know why can't x-3 = 1 be considered? if yes then x = 4 (which is not the answer )

I call them Verbal diaorea of GMAT. You have to follow these verbal vomits carefully. When they say x-3 is there only x-3 is guaranteed to be there nothing else. And so here you can not travel to the side of the stream.

Re: For a certain set of numbers, if x is in the set, then x - 3 [#permalink]

Show Tags

31 Dec 2012, 17:56

maibhihun wrote:

jayoptimist wrote:

For a certain set of numbers, if x is in the set, then x - 3 is also in the set. If the number 1 is in the set , which of the following must also be in the set ?

a) 4 b) -1 c) -5

A. a only, B. b only, C. c only, D. a and b only E. b and c only

I need to know why can't x-3 = 1 be considered? if yes then x = 4 (which is not the answer )

I call them Verbal diaorea of GMAT. You have to follow these verbal vomits carefully. When they say x-3 is there only x-3 is guaranteed to be there nothing else. And so here you can not travel to the side of the stream.

that's true, I have no problem with math, but I have quite problem with those kinds of "Verbal diaorea of GMAT". Hope exercises will help much. Thanks

Re: For a certain set of numbers, if x is in the set, then x - 3 [#permalink]

Show Tags

03 Mar 2014, 12:47

Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email. _________________

Re: For a certain set of numbers, if x is in the set, then x - 3 [#permalink]

Show Tags

27 Apr 2014, 09:18

It does not make logical sense to only have -5 and 4 is not the correct answer.

Can't we take that 1 is the result of X -3 ? In which case, X = 4.

I cant agree with -5 more because it is one more "jump"

X = 1 .... 2nd number is ( -2 ) is fine with me. But the question did not say that "X - 6" also exists? Because X is still 1, and did not "move on" to become -2.

Agree its a bit of a "throw you off if you did not buy our official guide" even if you had maths as your bach degree.

Hope this kind of stuff don't pop up for my coming exam, but it cant be helped =)

Re: For a certain set of numbers, if x is in the set, then x - 3 [#permalink]

Show Tags

30 May 2015, 00:44

Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email. _________________

So, my final tally is in. I applied to three b schools in total this season: INSEAD – admitted MIT Sloan – admitted Wharton – waitlisted and dinged No...

A few weeks ago, the following tweet popped up in my timeline. thanks @Uber_Mumbai for showing me what #daylightrobbery means!I know I have a choice not to use it...

“This elective will be most relevant to learn innovative methodologies in digital marketing in a place which is the origin for major marketing companies.” This was the crux...