Sum the series : `1+(1+1/2)+(1+1/2+1/4)+……. `upto n terms.

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

Find the sum of the following series : 1+(1+2)+(1+2+3) + .... to n terms .

Find the sum of the series – 1 + 5 + 11 +….to n terms.

Obtain the sum of the series : 1/1.4+1/4.7+1/7.10 + .......... to n terms.

Find the sum of the following series : 1.2+2.3+3.4+ .... to n terms .

Find the sum of n terms \ of the series: 1/(1. 2)+1/(2. 3)+1/(3. 4)+dot+ 1/n dot((n+1))

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

Sum of the series sum_(r=1)^(n) (r^(2)+1)r! is

The sum to infinity of the series 1+2(1-(1)/(n))+3(1-(1)/(n))^(2)+ . . .. . . . , is (A) n^(2) (B) n(n+1) (C) n(1+(1)/(n))^(2) (D)None of these

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