Mathematics, 07.09.2020 21:01 hardwick744
the first four terms of an arithmetic progression whose first term is -2 and the common diff. is -2 is
Answers: 2
![S_{n} =\frac{n}{2} [2a+(n-1)d]](/tpl/images/0745/1853/51f47.png)
![\frac{4}{2} [2*(-2)+(4-1)*-2]](/tpl/images/0745/1853/e7bf1.png)
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the first four terms of an arithmetic progression whose first term is -2 and the common diff. is -2...
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