The sum to infinity of the series `1+4/7+9/49+16/343+....` is

If the sum to infinity of the series 1 + 4x + 7x^2 + 10x^3 +............. is 35/16 then x=

If the sum to infinity of the series 1 + 4x + 7x^2 + 10x^3 +............. is 35/16 then x= (A) 1/5 (B) 2/5 (C) 3/7 (D)1/7

If the sum to infinity of the series 1 + 4x + 7x^2 + 10x^3 +............. is 35/16 then x= (A) 1/5 (B) 2/5 (C) 3/7 (D) 1/7

If the sum to infinity of the series 1 + 4x + 7x^2 + 10x^3 +............. is 35/16 then x= (A) 1/5 (B) 2/5 (C) 3/7 (D) 1/7

If the sum to infinity to the series 1+4x+7x^2+10x^3+..... is 35/16 the value of x is

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+ (4)/(5) + (7)/(5^2) + (10)/(5^3) +....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 the sum to infinity of the series 3 + (3 + d). (1)/(4) + (3 + 2d) (1)/(4^(2)) + ..... " is " (44)/(9) then find d

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 ddot