1.

Give a production grammar for the language L = {x/x ∈ (a,b)*, the number of a’s in x is multiple of 3}.$

A. {S->bS, S->b,S->aA, S->bA, A->aB, B->bB, B->aS, S->a}
B. {S->aS,S->bA,A->bB,B->bBa,B->bB}
C. {S->aaS,S->bbA,A->bB,B->ba}
D. None of the above
Answer» B. {S->aS,S->bA,A->bB,B->bBa,B->bB}


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