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

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

If .^(n)P_(r)=.^(n)P_(r+1) and .^(n)C_(r)=.^(n)C_(r-1) , find n and r.

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

If P(11,r)=P(12,r-1) find n

(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.

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

If P (1,-3), Q ( 2,-5), R ( -4,7) then find d(P,Q) d(P,R)

If (P)/(15)=(Q)/(21)=(R)/(7) then find the ratio P:Q:R

If (p)/( q - r) = (p + q)/( r) = (q)/( p) , Then find q : p : r