Sum the series `1^3 + 2^3 + 3^3 +……+(15)^3`.

Sum to n terms the series : 1^2 - 2^2 + 3^2 - 4^2 + 5^2 - 6^2 + ...

Sum of the series 1^(2) + 3^(2) + 5^(2) + … + n^(2) is :

Find the sum of n terms of the series : 1^2 + 3^2 + 5^2 +...

Find the sum of the series (1^3)/1+(1^3+2^3)/(1+3)+(1^3+2^3+3^3)/(1+3+5)+ up to n terms.

Find the sum of the series : 1+ 2/3+1/3+0 +…….. To 19 terms.

If the sum to infinity of the series 1 + 4x + 7x^2 + 10x^3 +............. is 35/16 then x= (A) 1/5 (B) 2/5 (C) 3/7 (D) 1/7