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Which of the following can be accepted by a DPDA?

(a) The set of even length palindrome over {a,b}

(b) The set of odd length palindrome over {a,b}

(c) {xx^c| where c stands for the complement,{0,1}}

(d) None of the mentioned

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Right answer is (d) None of the mentioned

Explanation: Theorem: The language pal of palindromes over the alphabet {0,1} cannot be accepted by any finite automaton , and it is therefore not regular.

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