Consider the following grammar over the alphabet abc given below S and T are non terminals gate computer science 2017
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Consider the following grammar over the alphabet {a,b,c} given below, S and T are non-terminals. -gate computer science 2017

G1: S-->aSb|T
T--> cT|∈

G2: S-->bSa|T
T--> cT|∈
The language L1(G1) ∩ L2(G2).
A) Finite
B) Non-finite but regular
C) Context-free but not regular
D) Recursive but not context-free



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Answers

B) Non-finite but regular

Explanation: 
The language generated by grammar G1 is anc*bn where n>=0 
The language generated by grammar G2 is bnc*an where n>=0 
The intersection of two languages will be c* (putting n=0 in both languages)
We know that c* is a regular language and infinite, so option b is correct.
 
This explanation is contributed by Deepak Raj

deepuckraj

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