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GATE | GATE CS 2020 | Question 42
Consider the following languages.
L1 = { wxyx ∣ w,x,y ∈ (0+1)+ }
L2 = { xy ∣ x,y ∈ (a+b)*, ∣x∣=∣y∣, x≠y }
Which one of the following is TRUE ?
(A)
L1 is regular and L2 is context- free
(B)
L1 context- free but not regular and L2 is context-free
(C)
Neither L1 nor L2 is context- free
(D)
L1 context- free but L2 is not context-free
Answer
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