If \(G\) is a grammar with productions \(S\rightarrow SaS\mid aSb\mid bSa\mid…

GATE · 2017 · CS · Set 1 · Computer Science & IT

If \(G\) is a grammar with productions

\(S\rightarrow SaS\mid aSb\mid bSa\mid SS\mid\epsilon\)

where \(S\) is the start variable, then which one of the following strings is not generated by \(G\) ?

  1. A.

    \(abab\)

  2. B.

    \(aaab\)

  3. C.

    \(abbaa\)

  4. D.

    \(babba\)

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Correct answer: D

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