n(n-1)(n-2)______(n-r+1)=n!/(n-r)!
sunilkamboj15206:
please tell me the solution
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=>Taking L.H.S.
n(n-1)(n-2)..........(n-r+1)
Multipling and dividing by (n-r)(n-r-1)..........1
=>n(n-1)(n-2)........(n-r+1)(n-r)(n-r-1)........1/(n-r).......1
=>n!/(n-r)!
Hope it helps you
^_^
n(n-1)(n-2)..........(n-r+1)
Multipling and dividing by (n-r)(n-r-1)..........1
=>n(n-1)(n-2)........(n-r+1)(n-r)(n-r-1)........1/(n-r).......1
=>n!/(n-r)!
Hope it helps you
^_^
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