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30 May, 13:03

Mrs Nicholas is buying Christmas presents for her five children to give to one another. If each child gives a present to each of the others, how many presents must she buy?

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  1. 30 May, 16:14
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    This is given by number of permutations of 2 from 5

    = 5! / (5 - 2) ! = 120 / 6 = 20 Answer
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