DFA to Accept Strings a’s and b’s Having Only 4 a 's | Transition Diagram & Table | Automata Theory

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Welcome to this detailed tutorial on how to design a DFA (Deterministic Finite Automata) that accepts strings over a’s and b’s having only 4 a’s.
In this video, we clearly explain how to solve this problem step by step, starting from the basic idea to the final transition table and transition diagram.

You’ll learn:

How to construct a DFA that accepts strings containing exactly four a’s.

The logic behind state transitions for different combinations of a’s and b’s.

How to test the DFA with multiple example strings to confirm it works perfectly.

How to verify your transition diagram using test cases.

This video is perfect for students studying Automata Theory, Theory of Computation (TOC), or Formal Languages and Automata.
If you’re preparing for university exams, GATE, or placement interviews, this video will help you understand the concept deeply and solve similar DFA problems easily.

👉 Watch till the end for a clear explanation and correct validation of the DFA.
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Comment below if you have any doubts — I’ll be happy to help!
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