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The sequence is 60,30,15,15/12 btw if you can’t see it clear in the image.

The sequence is 60,30,15,15/12 btw if you can’t see it clear in the image.-example-1

1 Answer

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The sequence is arithmetic, so

Explicit formula is:

for a1 = 60 and d = -30


\begin{gathered} a(n)=60-30(n-1) \\ a(n)=60-30n+30 \\ a(n)=90-30n \end{gathered}

Recursive formula is:


\begin{gathered} a(n)=a_(n-1)-30,\text{ for n>1} \\ a(1)=60 \end{gathered}

User Ray Cheng
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