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[" Also find the sum of the first "15" terms in each case."],[" 11.If the sum of the first "n" terms of an "AP" is "4n-n^(2)" ,what is the first term (that is "S_(1)" )? What "],[" is the sum of first two terms? What is the second term? Similarly,find the "3rd" ,the "10" th and "]

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