Let R1 and R2 be regular sets defined over the alphabet, then

1.	Let R1 and R2 be regular sets defined over the alphabet, then
A.	R1 ∩ R2 is not regular
B.	R1 ∪ R2 is not regular
C.	∑* - R1 is regular
D.	R1* is not regular
Answer» D. R1* is not regular

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Let R1 and R2 be regular sets defined over the alphabet, then

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