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2 March, 16:49

Find the 9th partial sum, s9, for the sequence 1, - 1, 1, - 1, ...

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  1. 2 March, 17:12
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    The ninth partial sum:

    We would determine the sequence to the ninth term:

    Sn = 1, - 1, 1, - 1, 1, - 1, 1,-1, 1, ...

    S₉ = 1 + (-1) + 1 + (-1) + 1 + (-1) + 1 + (-1) + 1 = 1.

    S₉ = 1
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