[問題]GWD11-Q4

[myron]

If S is the sum of the reciprocals of the consecutive integers from 91 to 100, inclusive, which of the following is less than S?
I.1/8 II.1/9 III.1/10

A.None
B.I only
C.III only
D.II and III only
E.I, II, and III

答案是C

求救......該如何解??? :o

[吳志道]

前面有相關的喔 ^^ 你可以查查 加深映像

91-100 10項

10/100<S<10/91 S最大趨近於10/91 小於1/9 1/8 所以只有C ^^

[myron]

哦~原來如此,多謝啦!