[計量] 請教一題計量
Q. For any positive integer n, the sum of the first n positive integers equals
[n(n+1)]/2. What is the sum of all even integers between 99 and 300?
A.19,900 B.20,200 C.22,650 D.40,299 E.45,150
答案給A,我算出來是B,差了300,
想問一下,題目的意思,有沒有包含300呢?
謝謝!
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