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# If A, then B. If B, then C. If C, then D. If all of the

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Manager
Joined: 04 Jan 2008
Posts: 116
If A, then B. If B, then C. If C, then D. If all of the  [#permalink]

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10 Sep 2008, 04:32
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If A, then B.

If B, then C.

If C, then D.

If all of the statements above are true, which of the following must also be true?

(A) If D, then A.

(B) If not B, then not C.

(C) If not D, then not A.

(D) If D, then E.

(E) If not A, then not D.

--== Message from GMAT Club Team ==--

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If you would like to discuss this question please re-post it in the respective forum. Thank you!

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Director
Joined: 12 Jul 2008
Posts: 511
Schools: Wharton

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10 Sep 2008, 05:49
dancinggeometry wrote:
If A, then B.

If B, then C.

If C, then D.

If all of the statements above are true, which of the following must also be true?

(A) If D, then A.

(B) If not B, then not C.

(C) If not D, then not A.

(D) If D, then E.

(E) If not A, then not D.

C

The stimulus basically says If A happens, then D will always happen. Therefore, if D didn't happen, A could not have happened.
Manager
Joined: 04 Jan 2008
Posts: 116

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10 Sep 2008, 06:21
zoinnk wrote:
dancinggeometry wrote:
If A, then B.

If B, then C.

If C, then D.

If all of the statements above are true, which of the following must also be true?

(A) If D, then A.

(B) If not B, then not C.

(C) If not D, then not A.

(D) If D, then E.

(E) If not A, then not D.

C

The stimulus basically says If A happens, then D will always happen. Therefore, if D didn't happen, A could not have happened.

Then why the option B is correct too? It is displaying a more direct correlation between B and C.
VP
Joined: 21 Jul 2006
Posts: 1452

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Updated on: 10 Sep 2008, 07:31
dancinggeometry wrote:
If A, then B.

If B, then C.

If C, then D.

If all of the statements above are true, which of the following must also be true?

(A) If D, then A.

(B) If not B, then not C.

(C) If not D, then not A.

(D) If D, then E.

(E) If not A, then not D.

The answer should be C. I'll explain. Let's say:

A= GMAT
C= Computer test

So imagine I say:

If it's a GMAT, then it's a computer adaptive test. And if it's a computer adaptive test, then it's a computer test.

Since you're wondering about option B, can you say that if it's not a computer adaptive test, then it's not a computer test??? there are so many non computer adaptive tests that are also computer tests such as the IQ tests or even computer skills tests.

However, in option C, if it's not a computer test, then definitely it's not the GMAT

Originally posted by tarek99 on 10 Sep 2008, 06:31.
Last edited by tarek99 on 10 Sep 2008, 07:31, edited 1 time in total.
Manager
Joined: 09 Jul 2007
Posts: 235

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10 Sep 2008, 06:52
IMO C.
Director
Joined: 20 Sep 2006
Posts: 632

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10 Sep 2008, 19:57
Clear C

A -> B -> C -> D

Do the reverse:

not D -> NotA
VP
Joined: 17 Jun 2008
Posts: 1476

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11 Sep 2008, 04:35
Another C.

Think of A being subset of B, B superset of C, C superset of D....Thus, if grand superset D does not exist then grand child subset A will also not exist.
Director
Joined: 12 Jul 2008
Posts: 511
Schools: Wharton

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11 Sep 2008, 04:54
dancinggeometry wrote:
zoinnk wrote:
dancinggeometry wrote:
If A, then B.

If B, then C.

If C, then D.

If all of the statements above are true, which of the following must also be true?

(A) If D, then A.

(B) If not B, then not C.

(C) If not D, then not A.

(D) If D, then E.

(E) If not A, then not D.

C

The stimulus basically says If A happens, then D will always happen. Therefore, if D didn't happen, A could not have happened.

Then why the option B is correct too? It is displaying a more direct correlation between B and C.

Because the stimulus is not saying C if and only if B.

C could have other causes unrelated to B. However, we know that if B happens, C always happens.

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.
Re: Zumit CR 002 &nbs [#permalink] 11 Sep 2008, 04:54
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