math

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

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asked by amal
  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

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    posted by Damon

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