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13 September, 20:35

Write an explicit formula for the sequence 3,-9,27,-81

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  1. 13 September, 22:15
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    The initial value is 3. The common ratio is - 9/3 = - 3. The general formula is

    ... an = a1*r^ (n-1)

    So, for your values, ...

    ... an = 3 * (-3) ^ (n - 1)
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