Find `r` when `P(4,r)=6P(5,r-1)`

Find r if 5 P(4,r) = 6P ( 5,r-1) , r ge 1.

Find r if 4.P(6,r)=P(6,r+1)

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

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

Find r if : ^5P_r= "^6P_(r-1) .

Find r if "^5P_r = "^6P_(r-1) .

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

Find r, if 5^(4)P_(r)=6^(5)P_(r-1)

Find r, if 5^4P_r=6^5P_(r-1) .