Number Series Puzzles Questions

21. What number should replace the question mark?
  What is the next number?
Answer
Ans = 19, 21, 24.
The sequence progresses +1, +2, +3 repeated.
22. What number should replace the question mark?
  What is the next number?
Answer
Ans = 67.
What is the next number?
123456789101112131415




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