Sum to n terms that series.
`1+5x+9x^2+13x^3+………|x|<1`.

Sum to n terms the series 1+3+5+7+9+...

Sum to n terms the series : 2+5x + 8x^2+11x^3+........., |x| < 1 .

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

Find the sum to n terms of the following series : 1+ 3x+ 5x^2+7x^3+ .......... when |x|<1.

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

Find the sum to n terms of the following series : 1+2x+ 3x^2+4x^3+ .......... when |x|<1.

Find the sum to n terms of the following series : 1+4x+7x^2+10x^3 + .......... when |x|<1.

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

Find the sum to n terms of the series (1)/(1*3*5*7*9)+(1)/(3*5*7*9*11)+(1)/(5*7*9*11*13)+"......" . Also, find the sum to infinty terms.