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

Find the sum of infinity of 9+3+1+…

Find the sum to infinity of the series 1^2+2^2x+3^2x^2+oodot

If the sum to infinity of the series 1+2r+3r^2+4r^3+ is 9/4, then value of r is 1//2 b. 1//3 c. 1//4 d. none of these

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

Find the sum to ininity of the series 1-3x+5x^2+7x^3+..... oo when Ix| <1.

Find the sum of the series 1/(3^2+1)+1/(4^2+2)+1/(5^2+3)+1/(6^2+4)+oo

The sum of the series 1/(2!) - 1/(3!) + 1/(4!) - …….. upto infinity is

If the midpoints of the sides of a triangle are (2,1),(-1,-3),a n d(4,5), then find the coordinates of its vertices.

Find the sum to n terms of each of the series in 1/(1xx2)+1/(2xx3)+1/(3xx4)+.......