Find the sum of the series `1+3x+5x^2+7x^2+ ton` terms.

Find the sum of the series 1-3x+5x^2-7x^3+ ton terms.

Find the sum of the series 1-3x+5x^2-7x^3+ ton terms.

Find the sum of the series 1+4x+ 7x^(2)+ ... to n terms . Hence write down the sum to infinity when x lt 1 numerically .

Find the sum of the series 1+3x+5x^2+7x^3+...... n terms.

Find the sum of the series 1+3x+5x^(2)+7x^(2)+... to n terms.

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

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

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

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

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