Question

what Is
n!/r!(n+r)!+n!/(r-1)!(n-r+1)=(n+1)!/r!(n-r+1)!​

Answer 1

Answer:

L.H.S = n ! ( n − r ) ! r ! n!(n−r)!r! + n ! ( n − r + 1 ) ! ( r − 1 ) ! n!(n−r+1)!(r−1)! L.H.S = R.H.S Hence, Proved.Read more on Sarthaks.com - https://www.sarthaks.com/1116156/prove-that-n-n-r-r-n-n-r-1-r-1-n-1-r-n-r-1