1.

Let S and T be language over ={a,b} represented by the regular expressions (a+b*)* and (a+b)*, respectively. Which of the following is true?

A. ScT (S is a subset of T)
B. TcS (T is a subset of S)
C. S=T
D. SnT=Ø
Answer» D. SnT=Ø


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