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标题: [求助]GWD10-28 [打印本页]

作者: yaskemail 时间: 2005-8-24 00:53 标题: [求助]GWD10-28

Q28.

For any poitive 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

Please help!

作者: hsWang 时间: 2005-8-24 01:11

[(99+301)* 101]/2=20200

选B

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