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标题: GWD-10-Q28 [打印本页]

作者: whitecloud 时间: 2005-3-2 09:52 标题: GWD-10-Q28

Q28:

For any positive integer n, the sum of the first n positive integers equals [n(n+1)]/2.

What is the sum of all the even integers between 99 and 301?

A. 10,100

B. 20,200

C. 22,650

D. 40,200

E. 45,150

Answer: C

我觉得是B呀？

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