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Question

28 25 5 21 18 5 14

- 11 5
- 10 7
- 11 8
- 5 10
- 10 5

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Solution

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This is an alternating subtraction series with the interpolation of a random number, 5, as every third number. In the subtraction series, 3 is subtracted, then 4, then 3, and so on.

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