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40
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Let  a_1, a_2, a_3,... be a non-constant arithmetic sequence. (So, not all the terms are the same.) Suppose that  a_4, a_7, a_12 form a geometric sequence. If a_7=30, what is a_1?

 May 27, 2022
 #1
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\(a_1 = 5\)

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 May 28, 2022

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