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

asked May 3, 2018 50.3k views

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

The nth term is given by

$a_n=a+(n-1)d\ = 15 + (n-1)(-3)=\boxed{18-3n}$

Ddtraveller answered May 7, 2018

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