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The next number is 27. The numbers are in pairs. The lower number is subtracted from the higher and makes an incremental series 7, 8, 9 and you have to find the next pair to make the increment of 10. So you are looking for a number 10 higher than 17; which is 27.

9-2=7, 13-5=8, 19-10=9 and 27-17=10

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15y ago
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Q: What number follows 2 9 5 13 10 19 17?
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