Mathematics, 13.07.2020 23:01, mimithurmond03
the sum of the first 20 terms of an A. P is identical to the sum of the first 22 term. If the common difference is -2; find the first terms
Answers: 3
![S_{n}=\frac{n}{2}(2a+[n-1]d)\\\\S_{20}=\frac{20}{2}(2a+19*[-2])\\\\](/tpl/images/0704/3310/6f7ff.png)
![S_{22}=\frac{22}{2}(2a+21*[-2])\\\\](/tpl/images/0704/3310/a7fe5.png)
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the sum of the first 20 terms of an A. P is identical to the sum of the first 22 term. If the common...
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