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9 August, 17:43

Find the 9th term in the sequence 9,-18,36

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  1. 9 August, 18:03
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    Step-by-step explanation:

    hello:

    the sequence 9,-18,36 is geometric when the common ratio is:

    r = 36/-18=-18/9=-2

    let (An) this sequence the n-ieme term is : An=A1*r^ (n-1) ... A1=9 and n=9

    A9=9 * (-2) ^8 = 2304
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