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If L1 and L2 are regular languages is/are also regular language(s).

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If L1 and L2 are regular languages is/are also regular language(s).

(a) L1 + L2

(b) L1L2

(c) L1

(d) All of the mentioned

This question was addressed to me in class test.

My question is based upon Obtaining the regular Expression from the Finite automata topic in chapter Finite Automata and Regular Expression of Compiler

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The correct choice is (d) All of the mentioned

Explanation: All these expression give us a regular grammar when L1 and L2 are regular.

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