GWD-10-Q28

whitecloud

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？