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Mathematics 5 Online
OpenStudy (anonymous):

A cupboard contains 5 pairs of shoes, each of a different style. How many ways are there to select 4 of the shoes from the cupboard so that the selection contains exactly one matching pair? Note that each pair of shoes consists of distinguishable left and right foot.

OpenStudy (anonymous):

The answer would be 240. I can't explain it well though, sorry.

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