英语翻译A bag contains 6 chips,numbered 1 through 6,If 2 chips a

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英语翻译
A bag contains 6 chips,numbered 1 through 6,If 2 chips are chosen at random without replacement and the values on those 2 chips are multiplied,what is the probability that this product will be greater than 20?
（A）1/30 （B）1/15 (C)2/15 (D) 1/5 (E)13/15

一袋中有6个芯片,编号为1到6,如果随机选择2个芯片,两个芯片编号的乘积大于20概率是多少
解
所有结果用15种,
{1,2}
{1,3}
{1,4}
{1,5}
{1,6}
{2,3}
{2,4}
{2,5}
{2,6}
{3,4}
{3,5}
{3,6}
{4,5}
{4,6}
{5,6}
积大于20的有两种
{4,6}
{5,6}
the probability that this product will be greater than 20 is Two fifteenths
如果是：what is the probability that this product will be no greater than 20?,选择【E】
意思是不大于20的概率,看看是否少一个：no

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