|
Un article trouvé pour ce sujet.
 |
|
|
|
|
|
|
|
|
Decreasing numbers |
2011-04-13 |
|
Hadi pose la question :
A number is called a "decreasing number" if each digit in the number is less than the digit to its left.
For example, 87420 is a deceasing number. How many five-digit
decreasing numbers are there?
Claude Tardif lui répond. |
|
|
|
