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标题: gwd-5-13 [打印本页]

作者: thinkers 时间: 2005-4-14 14:09 标题: gwd-5-13

Q13:

What is the value of the integer n?

(1) n(n + 2) = 15

(2) (n + 2)n = 125

The right answer is B but why not D?

From (1) we can get 1,3,5,15 are the facters of 15. But only when n=3, n(n+2)=15 is valid.

From (2) we can get 125 = 5^3, so n=3, (n+2)^n is valid.

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