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23 July, 10:41

Find the sum of the first 16 terms of the series 14+11+8+5 + ... - 82

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  1. 23 July, 12:18
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    -136

    Step-by-step explanation:

    This series can be written as: (14 - 3*0) + (14 - 3*1) + ... + (14 - 3*n)

    The sum of the first 16 terms is:

    14*16 - 0 - 3 - 6 - 9 - ... = 224 - 360 = - 136

    This underlined bit can be calculated in many ways, I personally used my calculator, but there are formulas to do so.
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