Find the sum `1+2.2+3.2^2+4.2^3+....+n.2^(n-1)`

Find the sum : 3.1^2+4.2^2+5.3^2+.... upto n terms.

Find the sum of 1^1 n + 2^2 (n - 1) + 3^2 (n - 2) + 4^2 (n -3) ……upto 'n' terms.

Find the sum to n terms : 1/2+3/2^2+5/2^3+...+(2n-1)/2^n

The sum of the first n terms of the series 1^2+ 2.2^2+3^2 +2.4^2+.... is (n(n+1)^2)/2 when n is even. Then the sum if n is odd , is

Find the sum 1+(1)/(1+2)+(1)/(1+2+3)+......+(1)/(1+2+3+......+n)

Find the sum up to n terms :n.1+(n-1).2+(n-2)3+(n-3).4+....

Find the sum of the series: 1. n+2.(n-1)+3.(n-2)++(n-1). 2+n .1.

Find the sum of the series: 1. n+2.(n-1)+3.(n-2)++(n-1). 2+n .1.

Find the sum of the series: 1.n+2.(n-1)+3.(n-2)+...+(n-1).2+n.1