Cool 6-Digit Numbers

Probability Level 5

Let us call a 66-digit number cool if each of its digits is no less than the preceding digit. How many cool 66-digit numbers are there?

Details And Assumptions:

  • For example, 112446112446 is cool.

  • 233043233043 isn't cool.

Pratik Shastri by Pratik Shastri
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