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

User Linksonder
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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
User Webthaumaturge
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