Question: Let R 1 , R 2 be two recursive languages, and RE 1 , RE 2 be two recursively enumerable languages. State the class the

Let R1, R2 be two recursive languages, and RE1, RE2 be two recursively enumerable
languages. State the class the following languages belong to with reasons.
1. R1\cup R2
2. RE1\cup RE2
3. R1\cup RE2
4. R1\cap RE2

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