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GWD数学题
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
这题我这么算都是A,答案是B,有算出来的同学给解答一下吗? |
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