Permutation - A selection of a group of items or events from a set with regard to order. (Order is important.) Combination - A selection of a group of items or events from a set without regard to order. (Order doesn't matter.)
Joke, the son, thinks that choosing 5 CDs from a group of 20 CDs to take on a trip is permutation. Creepy thinks this is combination.
Who is correct?
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