Logic Puzzle

79. What number should replace the question mark?
  What is the next number?
Answer
Ans = 25.
There are two alternate sequences: +4 and -3.
80. What number should replace the question mark?
  What is the next number?
Answer
Ans = 6471589.
Reverse the first three digits, then the last four digits
123456789101112131415


161718192021222324252627282930


31323334353637383940

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