Math, asked by Abhiranjanpatel, 1 year ago

permutation and combination

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Answered by Anonymous
2
nP4=12×nP2

nP4/nP2=12

n!/(n-4)!/n!/(n-2)!=12

(n-2)!/(n-4)!=12

(n-2)!/(n-4)(n-3)(n-2)!=12

Now (n-2)! Cancel
So 12(n-4)(n-3)=0
,n=3,4 ans
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