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15 August, 22:28

An arithmetic series contains 20 numbers. The first number is 102. The last number is 159. Which expression represents the sum of the series?

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  1. 15 August, 22:43
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    You would be skipping 2.85 numbers each time.

    I think you would take 159 subtract 102 from it and get 57.

    Then you would divide that by 20 to get your answer of 2.85
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