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Mathematics, 19.03.2021 01:00 seanisom7

For part (a), find the sum of the first n terms of the geometric series. For part (b), find n for the given sum Sn 7+(-21)+63+(-189)+...
a. n=18
b. Sn= 3829​

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For part (a), find the sum of the first n terms of the geometric series. For part (b), find n for th...
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