Sum of the series .5+.55+.555+………. Up to n terms.

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

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

Find the sum of the series : 11 + 103 + 1005 +.... to n terms.

Sum to n terms: 0.5+0.55 + 0.555 +...

Find the sum of the following series up to n terms: .6+. 66 +. 666+...

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

Find the sum of the following series : 1.3+3.5+5.7+ .... to n terms .

Find the sum of n terms of the series 1. 2. 3+2. 3. 4+3. 4. 5+

If the arithmetic progression whose common difference is nonzero the sum of first 3n terms is equal to the sum of next n terms. Then, find the ratio of the sum of the 2n terms to the sum of next 2n terms.