Determine if it is an arithmetic or geometric sequence:72, 48, 24…

asked Mar 11, 2023 161k views

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1 vote

Notice that

$\begin{gathered} 48=72-24 \\ 24=48-24=(72-24)-24=72-2*24 \end{gathered}$

Therefore, the formula of the sequence is

$a_n=72-24(n-1);n\ge1$

Shreyas Dave answered Mar 18, 2023

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