[計量] CAT數學TEST4第15題
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 300?
(A)19,900
(B)20,200
(C)22,650
(D)40,299
(E)45,150
我算出來是 B 可是答案是 A
因為我多算了 300
可是我覺得between應該也可以算 300 吧!
可以去哪裡查 between 的定義 嗎?
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