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MCQ (Single Correct Answer)
GATE CSE 2015 Set 1
For any two languages L1 and L2 such that L1 is context free and L2 is recursively enumerable but not recursive, which of the following is/are necessarily true?
L1' (complement of L1) is recursive
2. L2' (complement of L2) is recursive
3. L1' is context-free
4. L1' ∪ L2 is recursively enumerable
(A) 1 only(B) 3 only(C) 3 and 4 only(D) 1 and 4 only
