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The variable which produces an epsilon is called:

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The variable which produces an epsilon is called:

(a) empty variable

(b) nullable

(c) terminal

(d) all of the mentioned

The question was posed to me in an online quiz.

My question is based upon Eliminating Epsilon Productions topic in chapter Properties of Context Free Languages of Automata Theory

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Right choice is (b) nullable

Easy explanation: Any variable A for which the derivation: A->*e is possible is called Nullable.

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