" 17The sum to infinity of the progression "9-3+1-(1)/(3)+..." is "

The sum of infinity of the progression 9-3+1-(1)/(3)+… is

If the sum to infinity of the series 1- ( 1+d) (1)/(3) +(1+ 2d) (1)/(9) -( 1+3d) .(1)/( 27) + ………" is" (9)/(16) , find d.

If sum to infinity of the series 3- 5r +7r^(2) -9r^(3) + ….." is " (14)/(9) . Find r.

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

The sum to infinity of the series : 1+2 ( 1-(1)/( n )) + 3( 1 - ( 1)/( n ))^(2) +"...." is :

Find the sum of infinity of 9+3+1+…

Find the sum to infinity of this geometric progression. 1,1/2,1/2^2,1/2^3,……

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