Grade 11Algebra
permutation and combination chapters question prove n!/r!= n(n-1)(n-2)...(r+1)
1 Answer
Arun
expand n!= n(n-1)(n-2)(n-3)(n-4).......(r+2)(r+1)r!
now divide by r!
you will get your result
n!/r! = n(n-1)(n-2)(n-3).....(r+1)
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