Congratulations my friend, you have really come a long way.
Yes indeed that is correct.
Keep up that good work.
How many eight-character passwords are there if each character is either an uppercase letter A-Z, a lowercase letter a-z, or a digit 0-9, and where at least one character and at least one number are used?
Total number of passwords possible =
then of these are all numbers and are all letters.
So the answer would be - - .