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Discrete Mathematics A pin consists of 6 characters. Each one of the characters can be digits...

Discrete Mathematics

A pin consists of 6 characters. Each one of the characters can be digits (0-9) or letters (upper case only).

1. How many codes are possible if there are no restrictions?

2. How many codes are possible if none of the characters can be repeated?

3. How many codes contain at least one repeated character?

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