An Internet service provider requires its customer to select a password consisting of four letters followed by three digits. Find how many such passwords are possible in each of the following cases: (a) Repetition of letters and digits is allowed. (b) Repetition of letters and digits is not allowed.

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An Internet service provider requires its customer to select a password consisting of four letters followed by three digits. Find how many such passwords are possible in each of the following cases: (a) Repetition of letters and digits is allowed. (b) Repetition of letters and digits is not allowed.

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(a)	Repetition of letters and digits is allowed.
(b)	Repetition of letters and digits is not allowed.