Answer: 21528000 choices
Step-by-step explanation:
Since there are 26 letters of the alphabet and no alphabet is to be used more than once,
then the first letter can be chosen in 26ways
Second letter can be chosen im 25ways
Third letter can be chosen in 24ways
Fourth letter can be chosen in 23ways.
Since we can only use even digits, then the even digits we have are "0,2,4,6,8"
Then the first digit can be chosen in 5ways
Second digit can be chosen in 4ways
Third digit can be chosen in 3ways.
Total number of choices for this pass word = 26×25×24×23×5×4×3 = 21528000 choices
