GMAT 考满分题库

Magoosh - 数学PS - 234
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$$\frac{1}{9}$$
显示答案
正确答案: C

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