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5 March, 16:17

How do I find a1 for the geometric sequence down below

Sn = 1640, r = 3, n = 8

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  1. 5 March, 19:35
    0
    a1=1640/2187

    Step-by-step explanation:

    Geometric sequence formula: an=a1 r^n-1 s8=1640=a1 3^8-11640=a1 3^8-11640=a1 3^71640=a1 2187a1=1640/2187
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