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Formal Language & Automata TheoryWrite a short note on: Pushdown Automata20257mFORMAL LANGUAGE & AUTOMATA THEORYWrite the difference between Pushdown Automata and Finite Automata.20247mFormal Language & Automata TheoryA language accepted by deterministic pushdown automata is closed under which of the following? (i) Complement (ii) Union (iii) Both (i) and (ii) (iv) None of the above20202mFORMAL LANGUAGE & AUTOMATA THEORYA language accepted by deterministic pushdown automata is closed under which of the following? (i) Complement (ii) Union (iii) Both (i) and (ii) (iv) None of the above20232m