Question: 4. Which among the following languages is not regular (cannot be defined by a regular expression or finite automaton)? a) L-(xI x-(a bcn, m positive

4. Which among the following languages is not regular (cannot be

4. Which among the following languages is not regular (cannot be defined by a regular expression or finite automaton)? a) L-(xI x-(a bcn, m positive integers) b) L-(xl x-(ab2 c)", n a positive integer) c) L-x lx-a" (bc)", n, m positive integers) O d) L-(x 1 x4"bek, n, m, k positive integers)

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