chafelimadiepe2nger
chafelimadiepe2nger
25-11-2016
Mathematics
contestada
nCr/nPr=r!
give proof.
Respuesta :
Аноним
Аноним
27-11-2016
It's 1/r!
nCr = n! / r!(n-r)!
nPr = n! / (n-r)!
If you divide the two you'd have:
n! / r! (n-r)! * (n-r)! / n! = 1/r!
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