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Which of the Following Problems Are Decidable

Question 19

Multiple Choice

Which of the following problems are decidable?
1) Does a given program ever produce an output?
2) If L is a context-free language, then is L' (complement of L) also context-free?
3) If L is a regular language, then is L' also regular?
4) If L is a recursive language, then, is L' also recursive?


A) 1, 2, 3, 4
B) 1, 2
C) 2, 3, 4
D) 3, 4

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