Number Series Puzzles Questions

29. What number should replace the question mark?
  What is the next number?
Answer
Ans = 6.
5749827 + 3864759 = 9614586
30. What number should replace the question mark?
  What is the next number?
Answer
Ans= 9.
(6 + 17) – (5 + 9)
123456789101112131415




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