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QUESTION

# A personal identification number may be set to be any 4 digits. (a) How many possible PINs are there? (b) How many possible PINs are there that do

- A personal identification number may be set to be any 4 digits.
- (a) How many possible PINs are there?
- (b) How many possible PINs are there that do not have a repeated digit? (c) How many possible PINs are there that do have a repeated digit?