Xiaoyue chooses a number from 1, 2, 3, 4, 5, and Dongdong chooses a number from 2, 3, 4, 5, 6, 7. What is the probability that exactly one of the two numbers is a multiple of the other?
小悦从1、2、3、4、5这5个自然数中任选一个数，冬冬从2、3、4、5、6、7这、6个自然数中任选一个数．选出的两个数中，恰好有一个数是另一个数的倍数的概率是多少？
<gadget id="calculator">13 / 30</gadget>
<output>13/30 = around 0.433333</output>

<result>13/30 = around 0.433333</result>