UGC-NET | UGC NET CS 2018 Dec – II | Question 80

Consider R to be any regular language and L​1​.L​2​ be any two context-free languages Which one of the following is correct ?
(A) (L1 ⋃ L2 ) − R is context free
(B) L1 − R is context free
(C) L1 is context free
(D) L1 ⋂ L2 is context free

Answer: (B)


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