Question 3 Students are required to create 5-character long passwords to access the library. The letters must be from lowercase letters or digits. Each password must start with a lowercase letter and end with a digit and contain at most 2 digits. How many valid passwords are there?

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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Question 3
Students are required to create 5-character long passwords to access the library. The letters
must be from lowercase letters or digits. Each password must start with a lowercase letter and
end with a digit and contain at most 2 digits. How many valid passwords are there?
Question 4
1
a) Give an example of a string that is accepted by this automaton.
b) Give an example of a string that is rejected by this automaton.
c) Describe the language of this automaton.
Transcribed Image Text:Question 3 Students are required to create 5-character long passwords to access the library. The letters must be from lowercase letters or digits. Each password must start with a lowercase letter and end with a digit and contain at most 2 digits. How many valid passwords are there? Question 4 1 a) Give an example of a string that is accepted by this automaton. b) Give an example of a string that is rejected by this automaton. c) Describe the language of this automaton.
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