If `nP_r = 720 nC_r,` then the value of `r,` is

If "^nP_r = "^nC_r , then

If ^nP_r=120 ^nC_(n-r) , find the value of r.

If .^nP_r = .^nP_(r + 1) and .^nC_r = .^nC_(r-1) then the value of n + r is..

If nC_(r)=nC_(r-1) and nP_(r)=nP_(r+1), then the value of n is

If n=7 and r= 5, then the value of ""^nC_r is :

If n=8 and r= 3, then the value of ""^nP_r is :

If n=5 and r= 3, then the value of ""^nC_r is :

if nP_(r)=720nC_(r), the value of r and the no.of six digit no.all digits which are odd is,and if 12P_(r)=11P_(6)+2*11P_(5),r=? and if 35C_(n+7)=35C_(4n-2) then n is equals to: