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If A, then B. If B, then C. If C, then D. If all of the [#permalink ]
14 Jan 2008, 21:59

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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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B?

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I have got 2 answers . Option B and option E. They both are similar. Is the Option D stated correctly (about reference for E)?

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IMO, B

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marcodonzelli wrote:

If A, then B. If B, then C. If C, then D. if A, then D and one must be also true is if not D, then not A. So C 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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VP

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sondenso wrote:

marcodonzelli wrote:

If A, then B. If B, then C. If C, then D. if A, then D and one must be also true is if not D, then not A. So C 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.

good job man, OA is C.

Manager

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why not B? plzz explain and also tell some tips to solve these kind of qstions...

Manager

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IF X then Y -- also implies --> If NOT Y then NOT X working backwards, If NOT D, then NOT C, IF NOT C then NOT B, and finally If NOT B, then NOT A so NOT D leads to NOT A

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I used the same logic to get to C.

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srp wrote:

IF X then Y -- also implies --> If NOT Y then NOT X working backwards, If NOT D, then NOT C, IF NOT C then NOT B, and finally If NOT B, then NOT A so NOT D leads to NOT A

Nice explanation!

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think logically. from the statements you get: A -> D by transitive property so if we know D did not happen from choice C, then A could not have happened because A causes D so Ans C: If not D, then Not A

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so if we know D did not happen from choice C, then A could not have happened because A causes D so Ans C: If not D, then Not A How about B? It should be correct as well, if I work on the same logic.

Could you please explian the flaw in B?

Thank you.

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GHIBI wrote:

so if we know D did not happen from choice C, then A could not have happened because A causes D so Ans C: If not D, then Not A How about B? It should be correct as well, if I work on the same logic.

Could you please explian the flaw in B?

Thank you.

B says, If NOT B then NOT C - which is not correct

We have "If B then C" which is NOT the same as "IF NOT B then NOT C"

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