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[" 12.If the sum of "n" terms of an A.P....

[" 12.If the sum of "n" terms of an A.P.is "S_(n)=3n^(2)+5n" ,then write its common difference."],[" If "k,2k-1" and "2k+1" are "3" consecutive terms of an A.P,then find the value of "k" ."]

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