The sum to infinity of the series `1+2/3+6/(3^2)+(10)/(3^3)+(14)/(3^4). . . . . .` is (1) 2 (2) 3 (3) 4 (4) 6

The sum to infinity of the series 1+2/3+6/3^2+14/3^4+...is

1+2/3+6/(3^2)+10/(3^3)+14/(3^4)+...oo=

The sum to infinity of the following series (1)/(1*2)+(1)/(2*3)+(1)/(3*4)+.... shall be

Find the sum to infinity of the following series : 1-2/3 + 3/3^2-4/3^3+5/3^4 - .......

In the sum to infinity of the series 3+(3+x) (1)/(4) + (3+2x)(1)/(4^(2))+ ..... "is" (44)/(9) find x.

The sum of the series (1)/(3)+(1)/(3^(2)xx2)+(1)/(3^(3)xx3)+(1)/(3^(4)xx4)+... is :

If the sum to infinity of the series 3 + (3 + d). (1)/(4) + (3 + 2d) (1)/(4^(2)) + ..... " is " (44)/(9) then find d

Find the sum to infinity of the following series : 1+2/3+ 3/3^2+4/3^3 + .......