Question: a) What are recursive and recursively enumerable languages? Which one of the two sets stands for decidable problems? b) What is a reduction? Briefly explain

a) What are recursive and recursively enumerable languages? Which one of

a) What are recursive and recursively enumerable languages? Which one of the two sets stands for decidable problems? b) What is a reduction? Briefly explain how this technique can be used to prove that certain problems are undecidable

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