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6 August, 17:04

The sum of the series below is 10,900. How many numbers, n, are in the series?

19 + 20.5 + 22 + 23.5 + ... + 181

27

100

109

135

+3
Answers (1)
  1. 6 August, 18:18
    0
    So the sum of the series is:

    S (n) = 1.5n + 17.5

    The reason why 1.5 is multiplied to n is because that is how much is changed.

    c. 109
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