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Thread: Summation sequence

  1. #1
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    Summation sequence

    ...
    Last edited by mjoshua; Mar 19th 2010 at 12:36 PM.
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  2. #2
    MHF Contributor
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    The summation of an arithmetic series is probably the best way to approach this problem.

    So he makes 24 calls the first day, 29 the next, etc. for 20 days total.

    How many calls does he make on the last day? 24 + 5(19) = 24 + 95 = 119

    So by the formula, he made \frac{20(24 + 119)}{2} total calls, which is 1430.
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