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If the sum of the first n terms of an AP is 4n – n2, what is the first term (that is S1)?

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asked Apr 25, 2017 in Mathematics by sforrest072 (157,439 points) ● 60 ● 409 ● 933

If the sum of the first n terms of an AP is 4n – n2, what is the first term (that is S1)? What is the sum of first two terms? What is the second term? Similarly, find the 3rd, the 10th and the nth terms.

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