Increasing Digits


There are 36 2-digit integers such that every digit in that integer increases from left to right (12, 13, 14, … 23, 24 etc). Find the total number of 4-digit integers such that every digit in that integer increases from left to right.

Remember, to solve this puzzle and appear on the leaderboard, email both your solution and your source code (in any language) to lewiscornwall13@gmail.com. Good luck!!

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