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Self doubt:

Is there any method to calculate number of states in dfa e.g."x mod y" type of question without drawing dfa?

Because in Gate time is vital factor.
in Theory of Computation by Active (1.2k points) | 204 views

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I asked from teacher they said  in gate they will give you such kind of Regular expresion so that you will be able to draw dfa directly , based on your previous experience  , they will not give you hard expression . so key is to practice more minimal dfa , no shortcut is there otherwise .

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