Here is the question:
6X000X9,700XX08,00000015,?,00000015,?,00000015
This question actually comes from the puzzles made by my friend. He gave me his puzzles recently but I couldn't figure it out. Any clues?
Hint1
For question 10, odd terms are comprised of 1234567890
Hint2
For question 11, the first number is 6,7,8,9,10
Hint3
For question 13, odd terms are comprised of 123456