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26 July, 11:28

Write the explicit formula for the arithmetic sequence. 3, - 3, - 9, - 15, - 21, ...

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  1. 26 July, 11:30
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    E first term (a1) is 3 and the common difference (d) is - 6

    nth term = a1 + (n-1) d

    = 3 + (n - 1) (-6)

    = 3 - 6n + 6 = - 6n + 9

    explicit formula is - 6n + 9
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