The 5th and 8th terms of a geometric sequence of real numbers are 7! And 8! Respectively. If the sum to first `n` tems of the G.P. is 2205, then `n` equals_______.

If the third and 11th terms of an A.P. are 8 and 20 respectively, find the sum of first ten terms.

Find the geometric series whose 5th and 8th terms are 80 and 640 respectively.

The 5th and 12th terms of a G.P. are 32 and 4096 respectively . Find the nth term of the G.P. :

The 4 th and 7 th terms of a G.P.are (1)/(27) and (1)/(729) respectively.Find the sum of n terms of the G.P.

The 4th, 7th and last terms of a G.P. are 10,80 and 2560 respectively. Find the number of terms of the G.P.

Find the 7 th term of the G.P.4,8,16,dots

The n^(th) term of the AP in 2,5,8 …. Is

If a,b,c be 7 th 11 th and 13 th terms respectively of a non constant A.P.If these are also the three consecutive terms of a G.P the sum of infinite terms of this G.P is Ka then K=?