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If the integer n is greater than 1, is n equal to 2? 1. n

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Director
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If the integer n is greater than 1, is n equal to 2? 1. n [#permalink] New post 05 Jun 2004, 11:41
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A
B
C
D
E

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If the integer n is greater than 1, is n equal to 2?

1. n has exactly 2 positive factors

2. the difference of any two distict positive factors of n is odd
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 [#permalink] New post 05 Jun 2004, 19:15
a) Any prime number has exactly two divisors ( Insufficient )
b) Sufficient
2 has divisors 2 and 1 and the difference between them is 1
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 [#permalink] New post 05 Jun 2004, 23:31
Anand,

what about 10 which as 2 & 5 as factors and still has difference (5-2 =3) as odd?

shouldn't the answer be E?
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 [#permalink] New post 06 Jun 2004, 03:40
difference between any two of the distincive fators is odd
10 has factors 1 and 5 and difference is 4 which is not odd
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Re: try this DS question [#permalink] New post 06 Jun 2004, 05:05
praveen_rao7 wrote:
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If the integer n is greater than 1, is n equal to 2?

1. n has exactly 2 positive factors

2. the difference of any two distict positive factors of n is odd


(1) => n is prime. Insufficient.
(2) => it should have one even factor, which is 2, and one more which should be only 1, because other ways we will not have the difference of ANY two factors odd. (statement 1 can be derived from 2). So the only integer is 2. Sufficient.

B is the answer.
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 [#permalink] New post 06 Jun 2004, 07:35
Thanks guys,

I mis-interpreted word "Any" in second choice. B is right . You guys rock.
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  [#permalink] 06 Jun 2004, 07:35
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