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A symbol X is ________ if there exists : S->* aXb

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A symbol X is ________ if there exists : S->* aXb

(a) reachable

(b) generating

(c) context free

(d) none of the mentioned
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The correct choice is (a) reachable

To elaborate: A symbol X is generating if there exists : X->*w for some w that belongs to T*.

Also, a symbol can never be context free.
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