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[" 9.Consider an A.P.with first term "a"...

[" 9.Consider an A.P.with first term "a" and "],[" common difference "d" .Let "S_(k)" denote the "],[" sum of the first "k" terms.If "(S_(kx))/(S_(x))" is "],[" independent of "x" ,then "],[[" 1) "a=2d," 2) "a=d," 3) "2a=d" 4) "2a=3d]]

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