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标题: GWD 3-11 [打印本页]

作者: summersmiles 时间: 2007-2-20 13:03 标题: GWD 3-11

我在概念上有些不太明白这些题,可否有牛牛给解答一下.感激万分!!

Q11:

If s is the product of the integers from 100 to 200, inclusive, and t is the product of the integers from 100 to 201, inclusive, what is 1/s + 1/t in terms of t?

A. (201)²/t

B. [(202)(201)]/t

C. 201/t

D. 202/t

E. [(202)(201)]/t²

作者: cherrywds 时间: 2007-2-21 07:22

s=100*101*...*199*200

t=100*101*...*199*200*201

s=t/201, 1/s=201/t

1/s+1/t=201/t+1/t=202/t

D is the correct answer.

作者: SunnyApples 时间: 2007-2-23 08:57

ding !!!!!!!!!!!!

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