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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: 22 May 2007
Posts: 218

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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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09 Jul 2008, 03:25
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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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Director
Joined: 14 Aug 2007
Posts: 726

Kudos [?]: 222 [0], given: 0

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09 Jul 2008, 04:13
aaron22197 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.

if A then B -->> if not B then not A

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Senior Manager
Joined: 25 Nov 2006
Posts: 264

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09 Jul 2008, 05:58
It's C, was just posted a while ago...it's called the contrapositive theory.

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Re: CR-ABCD   [#permalink] 09 Jul 2008, 05:58
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# If A, then B. If B, then C. If C, then D. If all of the

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