A key code must contain 4 letters and 3 numbers. The letters may be any letter of the alphabet. The numbers should be any number from 0 to 9. How many different key code combinations are there?
You can choose any number from 10 possibilities, and the number can be repeated. The number possibilities are: 10^3 Applying the same method the letters possibilities are: 26^4
By multiplying them the final result is: A. 456,976,000
