Mathematics, 28.03.2020 22:41 ely093
What is the sum of the first 30 terms of the arithmetic sequence : -3,0,3,6...84
Answers: 1
![S=\frac{n}{2} [2a_1+(n-1)d]](/tpl/images/0569/1278/d6740.png)
![S=\frac{30}{2} [2(-3)+(30-1)3]](/tpl/images/0569/1278/39436.png)
![S=15[-6+87]](/tpl/images/0569/1278/05b86.png)
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What is the sum of the first 30 terms of the arithmetic sequence : -3,0,3,6...84...
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