n!/3!(n-3)!:n!/5!(n-5)!=5:3

n=7
  • -1
n!/3!(n-3)!:n!/5!(n-5)!
  • -3
n!÷3!(3n-3):n!÷5!(n-5)=5:3
  • 0
n!/3!(n-3)!:n!/5!(n-5)!:=5:3
  • -2
n! n! (1) 3!(n-3): 5!(n-5) =>
  • 0
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