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25 March, 12:18

Find S5 when Sn = 40 - 8n

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  1. 25 March, 12:28
    0
    S (n) = - 8n + 40

    Substitute 5.

    S (5) = - 8 (5) + 40

    = - 40 + 40

    S (5) = 0
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