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The value of r, such that 1 + r + r^(2) ...

The value of r, such that `1 + r + r^(2) + r^(3) … = 3/4 ` is …

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If 1+9r^2+81r^4=256 and 1 + 3r + 9r^2= 32 , then find the value of 1 - 3r + 9r^2 . यदि 1+9r^2+81r^4=256 और 1 + 3r + 9r^2= 32 ,तो 1 - 3r + 9r^2 का मान ज्ञात करें :

Prove that r_(1)+r_(2)+r_(3)-r=4R

Prove that r_(1)+r_(2)+r_(3)-r=4R

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