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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] New post 30 Jan 2008, 08:33
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: CR - If A, then B. [#permalink] New post 30 Jan 2008, 09:11
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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Re: CR - If A, then B. [#permalink] New post 30 Jan 2008, 09:50
OA is C.

If not D, then not A. Makes sense now, after knowing the right answer :)
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Re: CR - If A, then B. [#permalink] New post 30 Jan 2008, 09:53
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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Re: CR - If A, then B. [#permalink] New post 30 Jan 2008, 11:09
Definitively, it is a TRICKY question!!!!!!
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Re: CR - If A, then B. [#permalink] New post 30 Jan 2008, 11:16
Straight C.

If A happens then D happens, so if D didn't happen then A couldn't have happened!
Re: CR - If A, then B.   [#permalink] 30 Jan 2008, 11:16
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