Practice of G.P.

If p^(th),q^(th) and r^(th) terms of an A.P.are in G.P. then the common ratio of G.P.is-

if a,b,c are in G.P. and 3a, 7b, 15c are first 3 term of A.P. Also the common ratio of G.P. in(0,(1)/(2)) then the 4th term of A.P is

If second third and sixth terms of an A.P.are consecutive terms o a G.P.write the common ratio of the G.P.