According to the Sleep Council, what is the possible number of teenagers surveyed thathave a

問題詳情

52.According to the Sleep Council, what is the possible number of teenagers surveyed thathave a phone, music system, and TV in their bedroom?
(A) 250.
(B) 510.
(C) 660.
(D) 810.

參考答案

答案：C
難度：困難0.212121
統計：A(7),B(5),C(7),D(8),E(0)

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