SOLUTION: Determine how many different computer passwords are possible if (a) digits and letters can be repeated , (b) digits and letters cannot be repeated. 3 digits followed by 4 lette

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Question 836270: Determine how many different computer passwords are possible if (a) digits and letters can be repeated , (b) digits and letters cannot be repeated.
3 digits followed by 4 letters?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
DDDLLLL
a) N=10%2A10%2A10%2A26%2A26%2A26%2A26=456976000
b) N=10%2A9%2A8%2A26%2A25%2A24%2A23=258336000