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What is the sum of the first 15 term of the arithmetic sequence 17, 12, 7, 2,...​

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Answer:

17, 12, 7, 2, -3, -8, -13, -18, -23, - 28, -33, -38, -43, -48, - 53

Sn = n(A1+An/2)

S(15) = 15 (17 -53/2)

= 15(18)

S(15) = 270

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