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[" 20If "3+(1)/(4)(3+d)+(1)/(4^(2))(3+2d...

[" 20If "3+(1)/(4)(3+d)+(1)/(4^(2))(3+2d)+cdots" upto "oo=8" ,then the value of "d" is "],[[" a."9," b."5],[" c."1," d.None of these "]]

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