The locker code includes three numbers between $\"\"$ and $\"\"$ , inclusive.

A permutation of object is an arrangement of objects in a particular order.

To calculate the number of permutatioons without repetition is $\"\"$ .

In this case $\"\"$ .

The possible locker permutations $\"\"$

$\"\"$

$\"\"$ .

The possible locker permutations are $\"\"$ .