Cool 6-Digit Numbers

Discrete Mathematics Level 5

Let us call a \(6\)-digit number cool if each of its digits is no less than the preceding digit. How many cool \(6\)-digit numbers are there?

Details And Assumptions:

  • For example, \(112446\) is cool.

  • \(233043\) isn't cool.

Pratik Shastri by Pratik Shastri
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