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27 December, 12:40

Find ∑ (5 - 2k) when k goes from 2 to 7

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  1. 27 December, 14:43
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    Easiest way:

    5-4=1

    5-6=-1

    5-8=-3

    5-10=-5

    5-12=-7

    5-14=-9

    Add these up:

    30-54=-24
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