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A box contains 20 balls number

[单选题]
A box contains 20 balls numbered from 1 to 20 inclusive. If Jane removes a ball at random and replaces it, and then Kate removes a ball at random, what is the probability that both women removed the same ball?
  • 1/400
  • 1/200
  • 1/90
  • 1/20
  • 1/10

应该考虑20种情况的累加!


发表于 2020-03-18 16:04:36 回复(0)