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Please help me on 5 I don’t know what I did wrong on the last two

Please help me on 5 I don’t know what I did wrong on the last two-example-1
User Daviz
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1 Answer

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10 votes

ANSWER:


\begin{gathered} a_n=18-3(n-1) \\ a_(100)=-279 \end{gathered}

Explanation:

We have the following sequence:


18,15,12,9\ldots

Therefore, the sequence is:


a_n=18-3(n-1)

Now, when n is 100:


\begin{gathered} a_(100)=18-3(100-1) \\ a_(100)=18-297 \\ a_(100)=-279 \end{gathered}

User Aanund
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