math

find the number of permutations of 5 out of 9. then find 6 out of 6

1. 👍 0
2. 👎 0
3. 👁 125
1. n!/(n-r)! = 9!/4! = 9*8*7*6*5 = 15120

6!/0! = 6*5*4*3*2 = 720
because 0! is defined as 1

1. 👍 0
2. 👎 0
posted by Damon

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