A box contains 10 pairs of shoes (20 shoes in total). If two shoes are selected at random, what is the probability that they are matching shoes?
• A$\frac{1}{190}$
• B$\frac{1}{20}$
• C$\frac{1}{19}$
• D$\frac{1}{10}$
• E$\frac{1}{9}$

• 网友解析

### 题目讨论

• 优质讨论
• 最新讨论

• 所属科目:数学PS
• 题目来源1:Magoosh-234
• 正确率: 0%
• 难度: