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16 May, 06:11

A relay team of 4 swimmers is to be formed from a swim team with 20 member. How many different relay teams are possible?

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  1. 16 May, 09:58
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    When order does not matter you use what is called n choose k formula

    n! / (k! (n-k) !) where n is the number of things to choose from and k is the number of choices made, in this case:

    20! / (4! (20-4) !) = 4845
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