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07.09.2020 •
Mathematics
the first four terms of an arithmetic progression whose first term is -2 and the common diff. is -2 is
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Ответ:
-20
Step-by-step explanation:where first term =a and common difference=d
=![\frac{4}{2} [2*(-2)+(4-1)*-2]](/tpl/images/0745/1853/e7bf1.png)
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