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13-08-2018
Mathematics

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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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Аноним Аноним

13-08-2018

This is given by number of permutations of 2 from 5

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

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