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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: 09 Jun 2005
Posts: 135

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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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24 Jun 2005, 02:06
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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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Manager
Joined: 15 Jul 2004
Posts: 73

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24 Jun 2005, 05:58
(B)
_________________

===========================
Let us make hay while the sun shines.
Don Quixote. Part i. Book. iii. Chap. xi.

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Manager
Joined: 28 Jan 2004
Posts: 198

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Location: Ghana

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24 Jun 2005, 13:47
I may be completely lost here but i'll go for A.
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It's not over until it's OVER!

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Director
Joined: 18 Feb 2005
Posts: 668

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24 Jun 2005, 15:59
We get

A=B=C=D

Refer to HongHu's link for Verbal Section (CR tips)

Means A=D which means Not D = Not A

C is the correct choice

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Senior Manager
Joined: 17 May 2005
Posts: 271

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Location: Auckland, New Zealand

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25 Jun 2005, 13:03
C from me too...

if something is A, then it must be B, and must be C and must be D.
Thus if something is not D, it is not C, and therefore not B and not A.

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Director
Joined: 18 Apr 2005
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Location: Canuckland

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26 Jun 2005, 16:17
C, C, C and C again

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Intern
Joined: 26 Jun 2005
Posts: 6

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26 Jun 2005, 23:38
C is the correct answer here.

A->D by transitive logic
take contrapositive of A->D
not D -> not A

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Manager
Joined: 09 Jun 2005
Posts: 135

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27 Jun 2005, 03:17
OA is C

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Senior Manager
Joined: 07 Nov 2004
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27 Jun 2005, 12:42
agree, C

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Intern
Joined: 12 Apr 2005
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27 Jun 2005, 13:34
i think it is A

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27 Jun 2005, 13:34
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