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From 5 different pairs of shoes, 4 shoes are picked at random. In how many ways can this be done so that no complete pair is picked?

Competition practicePermutations & Combinations
  • A210
  • B130
  • C80
  • D16

Step-by-Step Solution

Choose which 4 of the 5 pairs supply a shoe: . From each, take the left or right shoe: ignores the condition.)
Answer: C) 80

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