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19 August, 17:51

Evaluate the geometric series 1 + 6 + ... + 7776.

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  1. 19 August, 19:12
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    9331

    Step-by-step explanation:

    clearly, r=6

    So, if there are n+1 terms, 6^n = 7776

    n = 5

    S6 = a (r^6-1) / (r-1) = 1 (6^6-1) / (6-1) = 46655/5
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