Question

prove that n(n-1)(n-2)...(n-r+1)=n!/(n-r)!

Answer 1

n! /(n-r)!
=n(n-1)(n-2)(n-3).......(1)/(n-r)(n-r-1)(n-r-2).........((1)
=n(n-1)(n-2)......(n-r+1)
if you find it helpful mark as brainliest please