AMC 8 1989 Problem 25

AMC8 1989 年第 25 题

概率★★★★☆

Every time these two wheels are spun, two numbers are selected by the pointers. What is the probability that the sum of the two selected numbers is even?

每次转动这两个转盘时，指针各选中一个数字。两个选中数字之和为偶数的概率是多少？

AMC 8 1989 Problem 25 figure

A. $\displaystyle \frac{1}{6}$
B. $\displaystyle \frac{3}{7}$
C. $\displaystyle \frac{1}{2}$
D. $\displaystyle \frac{2}{3}$
E. $\displaystyle \frac{5}{7}$

正确答案 · Correct Answer

C

解析 · Solution

解析整理中

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