GMAT考题：OG2017Q-PS-22

GMAT考题

In which of the following pairs are the two numbers reciprocals of each other?

I. 3 and ~$\frac{1}{3}$~

II.~$\frac{1}{17}$~ and -~$\frac{1}{17}$~

III.~$\sqrt{3}$~and~$\frac{\sqrt{3}}{3}$~

I only

II only

I and II

I and III

II and III

毕出

题目分析：

两个数的乘积为 1，则这两个数互为倒数.

I. 3*1/3=1. 互为倒数

II. 1/17*(-1/17)!=1.不互为倒数

III. ~$\sqrt{3}$~ *~$\frac{\sqrt3}{3}$~ =1.互为倒数

综上：答案是 D.

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