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The 1st, 5th, and 13th terms of an arithmetic sequence, with common difference d, d # 0, are the firstthree terms of a geometric sequence,

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The 1st, 5th, and 13th terms of an arithmetic sequence, with common difference d, d # 0, are the firstthree terms of a geometric sequence, with common ratio r, r ? 1. Given that the 1st terms of bothsequences is 12, find the value of d and the value of r.

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