## Elementary Statistics (12th Edition)

$\frac{1}{10000}$
There are 10 digits, so by using the fundamental counting rule we can get the number of possibilities: $10\times10\times10\times10=10000$. We also know that $probability=\frac{number \ of \ good \ outcomes}{number\ of\ all\ outcomes}$, therefore $P=\frac{1}{10000}$.