If the first number cannot be 0, then choose one of the 9 numbers.

The second digit is optional, that is, choose one from the number of 10.

The third digit is optional, that is, choose one from the number of 10.

The fourth digit is an even number, that is, choose one of the five digits.

Then the probability is1/9 *10 *10 * 5 =1/4500.