For a G.P if `a=6 ,r=2` ,find `S10`​

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

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

(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., a=5, r=2 and S_(n) =635 then : n =

For an A.P., find S10 if a = 6 and d = 3.

If for a G.P., r=2 and S_(8) =510, then : t_(3) =

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., S_(3) : S_(6) =125 : 152 then : r =