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23 June, 14:27

Find the sum of the first 8 terms of the geometric series with a1=4 and r=3

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  1. 23 June, 15:31
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    An=a1 (r) ^n-1

    a1=4 (3) ^2-1

    a2=4 (3) ^3-1

    keep going till

    a8=4 (3) ^9-1
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