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MCQ (Single Correct Answer)
GATE CSE 2010
Let L1 be a recursive language. Let L2 and L3 be languages that are recursively enumerable but not recursive. Which of the following statements is not necessarily true?(A) L2 – L1 is recursively enumerable.(B) L1 – L3 is recursively enumerable(C) L2 ∩ L1 is recursively enumerable(D) L2 ∪ L1 is recursively enumerable
