Gate CS-2012 Question Paper With Solutions

Q. 24 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 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

Answer: (D)

Explanation:

Gate CS-2012 Question Paper With Solutions

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