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

Frode Lillerud asked Jan 11, 2023

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Frode Lillerud asked Jan 11, 2023

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21 votes

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

Illidan answered Jan 18, 2023

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