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What is the 87th term of the arithmetic sequence of 12,0,-12

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Explanation:

12,0,-12


a1 = 12 \\ a2 = 0 \\ d = a2 - a1 \\ d = 0 - 12 = - 12 \\ an = a1 + (n - 1) * d \\ \\ a87 = 12 + (87 - 1) * ( - 12) \\ a87 = 12 - 1032

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