Find number of all possible positive integers \(n\) in decimal presentation satisfying the conditions:

The leftmost digit of \(n\) is non-zero, and

Every digit in \(n\) occurs at most once within \(n\).

\(\)

**Clarification**:122 is not to be counted. The digit 2 in 122 occurs **twice** within 122.

×

Problem Loading...

Note Loading...

Set Loading...