The series `1*3^2+2*5^2+3*7^2+......`

Find the sum to infinity by finding the sum to n terms or directly of the series : 1+3/2+5/2^2+7/2^3 + ...........

Find the sum of the following series : 3.1^2+5.2^2+7.3^2 + .... to n terms .

Find the sum to n terms of the following series : 1+3/2+5/2^2+7/2^3 + ...........

Find the sum to n terms of the series: 3/(1^2 .2^2)+5/(2^2 .3^2)+7/(3^2 .4^2)+......

Sum of 25 terms of the series 1 . 3+2 . 5+3 . 7+.. , is