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Only the A, B, C, D, E, 2, 4, 9 keys work on a board and...

Only the A, B, C, D, E, 2, 4, 9 keys work on a board and they ask them to make passwords with 5 characters. How many different passwords can be made if:

a) There are no restrictions

b) Only of letters

c) Only numbers

Math   Statistics-And-Probability   
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