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

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

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New post 10 Sep 2008, 03:32
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A
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C
D
E

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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.

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Re: Zumit CR 002 [#permalink]

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New post 10 Sep 2008, 04:49
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.

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Re: Zumit CR 002 [#permalink]

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New post 10 Sep 2008, 05:21
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.

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Re: Zumit CR 002 [#permalink]

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New post 10 Sep 2008, 05:31
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
B= Computer Adaptive Test
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 ;)

Last edited by tarek99 on 10 Sep 2008, 06:31, edited 1 time in total.

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Re: Zumit CR 002 [#permalink]

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New post 10 Sep 2008, 05:52
IMO C.

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Re: Zumit CR 002 [#permalink]

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New post 10 Sep 2008, 18:57
Clear C

A -> B -> C -> D


Do the reverse:

not D -> NotA

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Re: Zumit CR 002 [#permalink]

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New post 11 Sep 2008, 03:35
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.

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Re: Zumit CR 002 [#permalink]

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New post 11 Sep 2008, 03:54
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.

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Re: Zumit CR 002   [#permalink] 11 Sep 2008, 03:54
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