For any positive integer n, the sum of the first n positive integ

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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? 15

A、10100.0
B、20200.0
C、22650.0
D、40200.0
E、45150.0

答案：B

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老师这里偶数的和不应该是（100+300）*201 / 2 吗

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