A computational system has passwords of either 4 or 5 characters (letter or digit). Note that English alphabet has 26 letters and there are 10 digits, consider that all letters are lowercase, i.e., non-case sensitive system. a) How many passwords are there? b) How many passwords are there if no character is repeated in a password? c) How many passwords are there if each password must have a digit?

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A computational system has passwords of either 4 or 5
characters (letter or digit). Note that English alphabet has 26
letters and there are 10 digits, consider that all letters are
lowercase, i.e., non-case sensitive system.
a) How many passwords are there?
b) How many passwords are there if no character is repeated
in a password?
c) How many passwords are there if each password must have
a digit?
Transcribed Image Text:A computational system has passwords of either 4 or 5 characters (letter or digit). Note that English alphabet has 26 letters and there are 10 digits, consider that all letters are lowercase, i.e., non-case sensitive system. a) How many passwords are there? b) How many passwords are there if no character is repeated in a password? c) How many passwords are there if each password must have a digit?
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