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[" 3] If the sum of first n terms of an ...

[" 3] If the sum of first n terms of an A.P.is cn "^(2)" ,then the sum of squares of those n terms is : "],[[" 裔 "," a) "(n(4n^(2)-1)c^(2))/(6)," b) "(n(4n^(2)+1)c^(2))/(3)," c) "(n(4n^(2)-1)c^(2))/(3)," d) "(n(4n^(2)+1)c^(2))/(6)]]

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