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

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Senior Manager
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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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30 Jan 2008, 09:33
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

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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Senior Manager
Joined: 22 Sep 2005
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Re: CR - If A, then B. [#permalink]

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30 Jan 2008, 10:11
bmwhype2 wrote:
suntaurian 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.

e?

Can you explain why E?

I thought B (it is the only one that negate the same relationship mentioned).

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Senior Manager
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Re: CR - If A, then B. [#permalink]

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30 Jan 2008, 10:50
OA is C.

If not D, then not A. Makes sense now, after knowing the right answer
_________________

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CEO
Joined: 21 Jan 2007
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Re: CR - If A, then B. [#permalink]

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30 Jan 2008, 10:53
suntaurian wrote:
OA is C.

If not D, then not A. Makes sense now, after knowing the right answer

yea, i'm incredibly sleepy right now.

i didnt know GMAT was testing logic rules. i think this answer is the contrapositive. its logic "formulas" more than anything.
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Senior Manager
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Re: CR - If A, then B. [#permalink]

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30 Jan 2008, 12:09
Definitively, it is a TRICKY question!!!!!!

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Director
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Re: CR - If A, then B. [#permalink]

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30 Jan 2008, 12:16
Straight C.

If A happens then D happens, so if D didn't happen then A couldn't have happened!

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Re: CR - If A, then B.   [#permalink] 30 Jan 2008, 12:16
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