There are 10 single digit numbers that can be used for each digit.
The first digit cannot be 1 , so that leaves 9 other possibilities.
The last digit must be even, so it can be 0, 2, 4,6, 8 ( 5 possibilities).
The 3 middle numbers can be any digit ( 10 numbers)
To find total combinations multiply all the possible numbers for each digit:
9 x 10 x 10 x 10 x 5 = 45,000 possibilities.
