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10 October, 11:02

What is the sum of the last 5 terms of the series 1 9 17 ... 49?

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Answers (2)
  1. 10 October, 13:15
    0
    The series is increasing by 8 each time.

    So that means the complete series is:

    1, 9, 17, 25, 33, 41, 49

    Add the last 5 digits:

    49 + 41 + 33 + 25 + 17 = 165

    Answer:

    165
  2. 10 October, 13:48
    0
    17,25,33,41,49

    the sum of those numbers is 165
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