Q.

Which of the following is not a regular expression?

A. [(a+b)*-(aa+bb)]*
B. [(0+1)-(0b+a1)*(a+b)]*
C. (01+11+10)*
D. (1+2+0)*(1+2)*
Answer» B. [(0+1)-(0b+a1)*(a+b)]*

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Theory of Computation

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