The sum to n terms of the G.P. ` 1 + (1)/(2) + (1)/(4) + …` is

The fourth term of the G.P. 4, - 2 , 1 , … is

Find the sum of: 24 terms and n terms of 2 (1)/(2) , 3 (1)/(3) , 4 (1)/(6) ,5 ,......,

The sum of n terms of the series (1)/(1 + x) + (2)/(1 + x^(2)) + (4)/(1 + x^(4)) + ……… is

Sum to n terms of the series :1 + 2 (1 + (1)/(n)) + 3 (1 + (1)/(n )) ^(2) + ………

Find the sum of first n term of a G.P. 1+(1)/(2)+(1)/(4)+(1)/(8)+...

If the sum of n terms of a G.P. is 3(3^(n+1))/(4^(2n)) , then find the common ratio.

If the sum of n terms of a G.P. is 3-(3^(n+1))/(4^(2n)) , then find the common ratio.

If the sum of n terms of an A.P. is n P +1/2n(n-1)Q , where P and Q are constants, find the common difference.

How many terms of the G.P. (2)/(9),-(1)/(3),(1)/(2), . . . . . . . . . . . must be added to get the sum equal to (55)/(72) ?

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