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24 April, 00:28

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

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  1. 24 April, 00:34
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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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