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  4. If 3+(1/4)(3+ d )+(1/42)(3+2 d )+ ldots ldots+ upto ∞=8, then the value of d is

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Q. If $3+\frac{1}{4}(3+ d )+\frac{1}{4^2}(3+2 d )+\ldots \ldots+$ upto $\infty=8$, then the value of $d$ is

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Solution:

Correct answer is (a) 9

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