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Weird DS from Princeton

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Weird DS from Princeton [#permalink] New post 10 Jan 2007, 06:29
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A
B
C
D
E

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0% (00:00) correct 0% (00:00) wrong based on 0 sessions
I think that explanation is wrong. C can't be 10 and D can't be 9, bcoz initial terms say that C<D, therefore B must be sufficient?
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 [#permalink] New post 10 Jan 2007, 09:51
AdrianG, I think u are right :).... The answer should be B :)

90 = 3 *3 * 2 * 5

Stat 1
o If c=9 and d = 10, then d-c = 1
o If c=3 and d = 30, then d-c = 29

INSUFF.

Stat 2
Consecutive integer and c < d implies only 1 solution c = 9 and d = 10 :)

SUFF.
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 [#permalink] New post 10 Jan 2007, 19:37
Fig wrote:
AdrianG, I think u are right :).... The answer should be B :)

90 = 3 *3 * 2 * 5

Stat 1
o If c=9 and d = 10, then d-c = 1
o If c=3 and d = 30, then d-c = 29

INSUFF.

Stat 2
Consecutive integer and c < d implies only 1 solution c = 9 and d = 10 :)

SUFF.


Agree. The stem itself states that c<d. So if c and d are consecutive positive integers AND cd =90, the only possible combination is c = 9 and d = 10.
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 [#permalink] New post 10 Jan 2007, 23:12
Adrian, I agree. Good work! :wink:

Where did you take this example from? Doesn't look like a GMATPrep interface.
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 [#permalink] New post 10 Jan 2007, 23:44
Helg, haven't you heard about Princeton Review? :)
  [#permalink] 10 Jan 2007, 23:44
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