The sum of `3/1.2 *1/2+4/2.3*(1/2)^2+5/3.4*(1/2)^3+.........` to n terms is equal to

Find the sum 3/(1xx2)xx1/2+4/(2xx3)xx(1/2)^2+5/(3xx4)xx(1/2)^3+ to n terms.

Find sum the series (n)/(1.2*3)+(n-1)/(2.3*4)+(n-2)/(3.4*5)+......... up to n terms..-

The sum of series 1/(1-3.1^2+1^4)+2/(1-3.3^2+2^4)+3/(1-3.3^2+3^4)+......... up to 10 terms, is equal to

The sum of the series (2)/(1.2)+(5)/(2.3)2^(1)+(10)/(3.4)2^(2)+(17)/(4.5)2^(3)+.... upto n terms is equal:

"The sum of the series, 1/ 2.3 ⋅ 2 + 2/ 3.4 ⋅ 2^ 2 + 3/ 4.5 ⋅ 2^ 3 + ... ... . . to n terms is

The value of the sum 1.2.3+2.3.4+3.4.5+… upto n terms is equal to

1+(1+2)/(2)+(1+2+3)/(3) +(1+2+3+4)/(4)+.. . to n terms =

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