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Inorder to simplify a context free grammar, we can skip the following operation:

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Inorder to simplify a context free grammar, we can skip the following operation:

(a) Removal of null production

(b) Removal of useless symbols

(c) Removal of unit productions

(d) None of the mentioned

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This interesting question is from CFG-Eliminating Useless Symbols in chapter Properties of Context Free Languages of Automata Theory

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Correct choice is (d) None of the mentioned

To explain: Inorder to simplify the grammar all of the process including the removal of null productions, unit productions and useless symbols is necessary.

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