Which variable does not drive a terminal string in grammar? S -> AB A -> a B…

2011

Which variable does not drive a terminal string in grammar? S -> AB A -> a B -> b B -> C

Answer: C. C — Variable C appears only on the right-hand side of B -> C and lacks any production rules. Unlike A, B, and S which derive terminals 'a' or 'b', C cannot…

  1. A.

    A

  2. B.

    B

  3. C.

    C

  4. D.

    S

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Correct answer: C

Variable C appears only on the right-hand side of B -> C and lacks any production rules. Unlike A, B, and S which derive terminals 'a' or 'b', C cannot generate a terminal string.

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