AMC 8 2004 Problem 21

AMC8 2004 年第 21 题

概率★★★☆☆

Spinners

A

and

B

are spun. On each spinner, the arrow is equally likely to land on each number. What is the probability that the product of the two spinners' numbers is even?

将转盘 A 和 B 各旋转一次。已知在每个转盘上，指针落在每个数字上的可能性都相同，那么这两个转盘上（指针所指的）数字之积为偶数的概率是多少？ Problem 22 At a party there are only single women and married men with their wives. The probability that a randomly selected woman is single is. What fraction of the people in the room are married men? 在某个聚会上，只有单身女性，以及已婚男性和他们的妻子。若随机选择一个女性，则她是单身的概率为。那么这个房间的所有人中，已婚男性占了多少比例？

A. $\frac14$
B. $\frac13$
C. $\frac12$
D. $\frac23$
E. $\frac34$

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