Problem 3: This one is all about counting and choosing
You are trying to escape from a prison (you where framed of a crime you didn’t commit)
A security system uses passwords of the following form.
Two letters followed by two digits. (Letters are a,......, z and Digits are 0, 1, 2,..., 9)
How many different passwords are there?
i). Assume you could have repeats e.g. aa22
ii). Assume no repeats
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