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2 -> 9 = +7

9 -> 5 = -4

5 ->13 = +8

13 -> 10 = -3

10 -> 19 = +9

19 -> 17 = -2

As you can see, every other time, the number is increased. It was originally increased by 7, then 8, then 9. So, the next number should be increased by 10 = 27

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11y ago
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Q: What number which best completes the sequence below 2 9 5 13 10 19 17?
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