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Which of the turing machines have existential and universal states?

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Which of the turing machines have existential and universal states?

(a) Alternating Turing machine

(b) Probalistic Turing machine

(c) Read-only turing machine

(d) None of the mentioned

I had been asked this question by my school teacher while I was bunking the class.

This intriguing question comes from Multitape Turing Machines in section Introduction to Turing Machines of Automata Theory

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Correct option is (a) Alternating Turing machine

Explanation: ATM is divide into two sets: an existential state is accepting if some transitions leads to an accepting state; an universal state is accepting if every transition leads to an accepting state.

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