Is the following a CFL? If yes then provide a pushdown automaton for it (no need to prove the equivalence); if not then prove your answer (e.g., using pumping lemma for CFLs). (a) {a, b, c}∗ − {anbncn | n ≥ 0} (b) {ambncp | m, n, p ≥ 0, mn = p}

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Is the following a CFL? If yes then provide a pushdown automaton for it (no need
to prove the equivalence); if not then prove your answer (e.g., using pumping lemma for CFLs).


(a) {a, b, c}∗ − {anbncn | n ≥ 0}


(b) {ambncp | m, n, p ≥ 0, mn = p}

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