Question: here is the other question from my c++ class. Please help me solve it. Thank you so much !! 9. A personal identification number may

here is the other question from my c++ class. Please help me solve it. Thank you so much !!

9. 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?

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