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

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

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

What is the value of r, if P(5, r) = P6, r-1) ?

(i) If ""^(5)P_(r)=2xx""^(6)P_(r-1) , find r. (ii) If ""^(20)P_(r)=13xx""^(20)P_(r-1) , find r. (iii) If ""^(11)P_(r)=""^(12)P_(r-1) , find r.

Iff ""^(5)P_(r)=""^(6)P_(r-1) find r.

If 7.5p_(r)=7p_(r-1) ,then find r

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