28, 25, 5, 21, 18, 5, 14, ... choose which pair of numbers comes next?
  • 111, 5
  • 210, 7
  • 311, 8
  • 45, 10
Answer:- 1
Explanation:-

Solution:
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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