问题 单项选择题

Raffle tickets numbered consecutively from 101 through 350 are placed in a box. What is the probability that a ticket selected at random will have a number with a hundreds digit of 2 ?()

A.A

B.B

C.C

D.D

E.E

答案

参考答案:A

解析:

从101至350,百位数字是2的数是200至299之间的数,包括200和299,一共有100个;从101至350中共有250个数字,因此 * * 百位数字是2的概率为:

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单项选择题
单项选择题