For a G.P.
i) `a = 2, r=-2/3` find `s_6`​

If for an A.P. (i) a=6, d=3, find S_(10) (ii) a=6, d=3 , find S_(6)

For a G.P. if S_(3)=1023 ,r=5 Find a

If in a G.P., a3 + a5 = 90 and if r = 2 find the first term of the G.P.

If for a G.P., a=5, r=2 and S_(n) =635 then : n =

(i) Given a G.P. with a=729 and 7th term 64 find S_(7) . (ii) If {a_(n)} is a G.P. and a_(1)=4,r=5 , find a_(6) and S_(6) .

If for a G.P., S_(2) =8 and S_(4) =80 , then : (a,r) -=

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

If for a G.P., S_(3) : S_(6) =125 : 152 then : r =