If `P(6,r)=24C(6,r)` then `r=`

If P(5,r)=2,P(6,r-1), find r

If P(5,r)=P(6,r-1),f in dr

If .^(n)P_(r)=24.^(n)C_(r) then r= _______

If P(5, r)=2.P(6, r-1), find r.

If 5.P(4,r)=6.P(5,r-1) then the value of r is

If P(5, r)=P(6, r-1) ,find r.

The set of values of r simultaneously satisfying the system of equations P(5,r)=2P(6,r-1) and 5P(4,r)=6P(5,r-1) is

If 6P_(r):6P_(5)=1:2, then prove that r=4

If P(12,r)=P(11,6)+6.P(11,5) then r=