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Suppose we have a password policy that passwords must: 1. consist of upper and lower case letters and digits; and 2. be between 6 and

Suppose we have a password policy that passwords must: 1. consist of upper and lower case letters and digits; and 2. be between 6 and 8 characters long. (a) How many passwords are there under these rules?

(b) How many passwords are there if we add the rule that no letter1 maybe used twice

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