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A push down automaton with only symbol allowed on the stack along with fixed symbol.

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A push down automaton with only symbol allowed on the stack along with fixed symbol.

(a) Embedded PDA

(b) Nested Stack automata

(c) DPDA

(d) Counter Automaton

I got this question in my homework.

Question is from PDA-Acceptance by Final State topic in chapter Push Down Automata of Automata Theory

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Correct answer is (d) Counter Automaton

Easy explanation: This class of automata can recognize a set of context free languages like {anbn|n belongs to N}

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