Computer Science · Theory of Computation
Which one of the following instances of the Post Correspondence Problem (PCP) has a viable solution sequence?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1{(ab, b), (b, a)}
- 2{(ab, abb), (ba, aaa), (aa, a)}
- 3{(ab, aba), (baa, aa), (aba, baa)}
- 4{(b, bb), (bb, bab), (bab, abb), (abb, babb)}✓
Correct answer
{(b, bb), (bb, bab), (bab, abb), (abb, babb)}
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