Mathematics, 03.01.2021 14:00 dpazmembreno
the sum of the first nine terms of an arithmetic series is 162, and the sum of the first 12 terms is 288. Determine the first five terms of the series.
Answers: 2
![\boxed{\orange{\sf S_n = \dfrac{n}{2}[2a+(n-1)d] }}](/tpl/images/1011/3603/db457.png)
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the sum of the first nine terms of an arithmetic series is 162, and the sum of the first 12 terms is...
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