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If A, then B. If B, then C. If C, then D. If all of the [#permalink]
24 Feb 2007, 03:32

00:00

A

B

C

D

E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct
0% (00:00) wrong based on 0 sessions

7.
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.

Hi Guys..
Thanks for u r reponses.
The OA is indeed C But, I argue why not B ? It is clearly said in the question statement tht "if B then C" that is C is there coz of B hence if there is no B then no C.

Contrapositive of this is also true:
if Not D then Not A

Deductive logic is fun and much more interesting than inductive logic. But most GMAT prep books do not address deductive logic . Some LSAT books do.
Alternatively, You can borrow the Copi-Cohen's book from local library and spend a weekend over it. I'm sure you will significantly improve your reasoning ability. _________________

"Education is what remains when one has forgotten everything he learned in school."

Hi Guys.. Thanks for u r reponses. The OA is indeed C But, I argue why not B ? It is clearly said in the question statement tht "if B then C" that is C is there coz of B hence if there is no B then no C.

can any one please enlighten ?

Thanks

It's not B because it says if B then C and not if B then only C. C may be because of lets say X.