Gate CS-2019 Question Paper With Solutions

Q. 40 Which one of the following languages over ∑ = {a, b} is NOT context-free?

(A) {anbi ⏐ i ∈ {n, 3n, 5n}, n≥ 0}

(B) {wanwRbn ⏐ w ∈ {a, b}*, n≥ 0}

(C) {wwR ⏐ w ∈ {a, b}*}

(D) {wan bn wR ⏐ w ∈ {a, b}*, n≥ 0}

Answer: (B)

Explanation:

Learn More:   Gate ME-2004 Question Paper With Solutions

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