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TiliK225 [7]
3 years ago
13

From a list of ten books, how many groups of 4 books can be selected

Mathematics
1 answer:
andreyandreev [35.5K]3 years ago
6 0

First you have all ten books, but then every time after, you loose one because you can't put the same book in the group twice.

10 * 9 * 8 * 7 = 5040 groups

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