prove that n!/(n-r)!r!+n!/(n-r+1)!(r-1)!=(n+1)!/r!(n-r+1)! - Brainly.in

prove that n!/(n-r)!r!+n!/(n-r+1)!(r-1)!=(n+1)!/r!(n-r+1)! - Brainly.in