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[" If "s" rdenotes the sum of "r" terms of "an" A."P" .and "(s_(a))/(a^(2))=(s_(b))/(b^(2))=c," then "s_(c)" is "],[[" (A) "c^(3)," (B) "(c)/(ab)],[" (C) "abc," (D) "a+b+c]]

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