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Answer to Question #38163 in Math for Sujata Roy
Question #38163
Which of the following are decidable?
1. Whether the intersection of two regular languages is infinite
2. Whether a given context-free language is regular
3. Whether two push-down automata accept the same language
4. Whether a given grammar is context-free
(A) 1 and 2 (B) 1 and 4
(C) 2 and 3 (D) 2 and 4
1. Whether the intersection of two regular languages is infinite
2. Whether a given context-free language is regular
3. Whether two push-down automata accept the same language
4. Whether a given grammar is context-free
(A) 1 and 2 (B) 1 and 4
(C) 2 and 3 (D) 2 and 4
Expert's answer
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