In how many ways can a person invite 4 out of their 13 closest friends to...
In how many ways can a person invite 4 out of their 13 closest friends to a dinner party?
Homework Answers
Number of ways to select r items from n, nCr = n!/(r! x (n-r)!)
Number of friends to choose from, n = 13
Number of persons to be invited, r = 4
Number of ways to invite 4 people from 13 = 13!/(4! x 9!)
= 715
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