# Probability

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There are 5 pairs of shoes with distinct size. Now choose any 4 from it randomly, find the probability that they form at least a pair.

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Solution. Consider choosing any 4 shoes as a basic event. It is easy to know ...

#### Solution Summary

There are 5 pairs of shoes with distinct size. Now choose any 4 from it randomly, find the probability that they form at least a pair.

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