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23-02-2017
Mathematics

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What is the general rule for the arithmetic sequence? 15, 12, 9, 6, …

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23-02-2017

15, 12, 9, 6, …
here first term (a)= 15
common difference (d) = 12-15 = 33

The nth term is given by

[tex]a_n=a+(n-1)d\ = 15 + (n-1)(-3)=\boxed{18-3n}[/tex]

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