Question: A computer system uses passwords that are exactly seven characters and each character is one of the 26 letters (a-z) or 10 integers (0-9). Uppercase

A computer system uses passwords that are exactly seven characters and each character is one of the 26 letters (a-z) or 10 integers (0-9). Uppercase letters are not used.

(a) How many passwords are possible?

(b) If a password consists of exactly six letters and one num- ber, how many passwords are possible?

(c) If a password consists of five letters followed by two num- bers, how many passwords are possible?

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