Question 584947
<pre>
We can choose the first digit any of 9 ways, 1,2,3,4,5,6,7,8 or 9

We can then choose the 2nd digit any of 9 ways, 0 or any of 8 ways not chosen for the 1st digit

We can then choose the 3rd digit any of the 9 ways we didn't choose for 2nd digit.

We can then choose the 4th digit any of the 9 ways we didn't choose for the 3rd digit.

We can then choose the 5th digit any of the 9 ways we didn't choose for the 4th digit.

That's 9򊷹򊷹 = 9<sup>5</sup> = 59049

Edwin</pre>