Question

prove that
n!/(n-r)!r! + n!/(n-r+1)!(r-1)!=(n+1)!/r!(n-r+1)!
here ! is factorial
plz help me ​

Answer 1

Answer:

$n!/(n-r)!r! + n!/(n-r+$

Answer 2

Answer:

your answer attached in the photo