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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
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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, 01:06
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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
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24 Jun 2005, 04:58
(B)
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Manager
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24 Jun 2005, 12:47
I may be completely lost here but i'll go for A.
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Director
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24 Jun 2005, 14:59
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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25 Jun 2005, 12:03
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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26 Jun 2005, 15:17
C, C, C and C again
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26 Jun 2005, 22:38
C is the correct answer here.

A->D by transitive logic
take contrapositive of A->D
not D -> not A
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27 Jun 2005, 02:17
OA is C
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27 Jun 2005, 11:42
agree, C
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27 Jun 2005, 12:34
i think it is A
27 Jun 2005, 12:34
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