Gate CS-2017-2 Question Paper With Solutions

Q. 48 Consider the following languages.
L1 = {ap | p is a prime number}
L2 = {anbmc2m | n >= 0, m >= 0}
L3 = {anbnc2n | n >= 0}
L4 = {anbn | n >= 1}

Which of the following are CORRECT ?
I. L1 is context free but not regular.
II. L2 is not context free.
III. L3 is not context free but recursive.
IV. L4 is deterministic context free.

(A) I, II and IV only

(B) II and III only

(C) I and IV only

(D) III and IV only

Answer: (D)

Explanation:

Gate CS-2017-2 Question Paper With Solutions

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