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2 February, 16:19

A recursive formula for the sequence 18 9 4.5

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  1. 2 February, 18:59
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    9 * (½) ^ (n-2)

    Step-by-step explanation:

    It's a Geometric sequence with:

    First term: 18

    Common ratio: 9/18 = ½

    Nth term: 18 * (½) ^ (n-1)

    9*2 * (½) ^ (n-1)

    9 * (½^-1) * (½) ^ (n-1)

    9 * (½) ^ (n-2)
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