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12, 42, 72, 102.... common difference/ratio?r = -30 d = 30d = 13r = 13
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12, 42, 72, 102.... common difference/ratio?r = -30 d = 30d = 13r = 13

User Aace
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\begin{gathered} 12,42,72,102,\ldots, \\ a_n=30n-18 \end{gathered}
d=30

User Samshull
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