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If A, then B. If B, then C. If C, then D. If all of the

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If A, then B. If B, then C. If C, then D. If all of the [#permalink] New post 08 Sep 2005, 19:24
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A
B
C
D
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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.

Explanations anyone? OA to come...
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 [#permalink] New post 08 Sep 2005, 23:33
I think this should help.

http://www.gmatclub.com/phpbb/viewtopic ... ighlight=b
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 [#permalink] New post 09 Sep 2005, 01:01
I still don't get it. Venn diagram? Transitive property? I know what both are, but how do I apply it to the question? Please help! :help2


kwasi7 wrote:
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 [#permalink] New post 09 Sep 2005, 05:31
I like to look at problems like this by adding words or examples that are true to make it clearer.

For example, in this case:

If someone is a direct marketer (A), then they are in advertising (B)
If someone is in advertising (B), then they are in marketing (C)
If someone is in marketing (C), then they are in business (D)

Then look at the answer choices and think about which is logically true:

(A) If someone is in business, then they are a direct marketer? No, not necessarily true, they could be in some other kind of business.

(B) If someone is not in advertising, then they are not in marketing? Again, not true. Someone could be in marketing without being in advertising.

(C) If someone is not in business, then they are not in direct marketing. This is true. Direct marketing is a subset of business, so all direct marketers are by definition also in business. C looks like the answer here. Check the others just to make sure.

(D) If someone is in business, then they are... ???. We don't know anything about E from the question stem. This is clearly not the answer.

(E) If someone is not in direct marketing, then they are not in business? Clearly untrue. There are a zillion other types of businesses other than direct marketing.

Therefore, the answer is C.

Hope this helps for people who get confused with this type of problem.
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 [#permalink] New post 09 Sep 2005, 08:58
trulyblessed wrote:
I still don't get it. Venn diagram? Transitive property? I know what both are, but how do I apply it to the question? Please help! :help2


kwasi7 wrote:


If A, then B.
If B, then C.
If C, then D.

What you need to do is simple to replace the cause and effect relationship with an arrow.

So,

If A, then B (A -> B)
If you reverse the property, it will read as If Not B, then Not A (!B-> !A)

The same applies for the other two statements.
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 [#permalink] New post 09 Sep 2005, 10:40
The answer is C......beyond any doubt.
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 [#permalink] New post 09 Sep 2005, 14:32
I couldn't have explained it better than Coffeeloverfreak's explanation. That explanation rocks!! The answer is C indeed. If logical CRs stump you, look no further than the logic pdf document.

Refer to Honghu's excellent explanations in the following link -http://www.gmatclub.com/phpbb/viewtopic.php?t=14547
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 [#permalink] New post 09 Sep 2005, 17:38
Darth_McDaddy wrote:
I couldn't have explained it better than Coffeeloverfreak's explanation. That explanation rocks!!


Aww, thanks! :oops:
Now if only I could convert that praise into a decent GMAT score...
(<-- having data sufficiency nightmares...)
  [#permalink] 09 Sep 2005, 17:38
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