Prep ps1

meckychen

In a survey of students, each student selected from a list of 12 songs the 2 songs that the student liked best.  If each song was selected 4 times, how many students were surveyed?

(A) 96

(B) 48

(C) 32

(D) 24

(E) 18

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【答案】D

【思路】

each song was selected 4 times
12 songs=>48 times
48/2=24人

为什么要除以2呢？

大荣

题目说每人从12首歌中选2首自己最喜欢的，相当每人选2次。所以总次数除2.

meckychen

谢谢你