A symbol X is called to be useful if and only if its is:(a) generating(b) reachable(c) both generating and reachable(d) none of the mentionedI have been asked this question during an interview.This interesting question is from Inferences to Trees, Trees to Derivations in division Context Free Grammars and Languages of Automata Theory

A symbol X is called to be useful if and only if its is:(a) generating

1.	A symbol X is called to be useful if and only if its is:(a) generating(b) reachable(c) both generating and reachable(d) none of the mentionedI have been asked this question during an interview.This interesting question is from Inferences to Trees, Trees to Derivations in division Context Free Grammars and Languages of Automata Theory
Answer» The correct option is (C) both GENERATING and reachable The best I can EXPLAIN: For a symbol X to be useful, it has to be both reachable and generating i.e. S->* aXb -> * w where w belongs to T*.

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