Let R1 and R2 be regular sets defined over alphabet ∑ then?

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answerhappygod
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Let R1 and R2 be regular sets defined over alphabet ∑ then?

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a) R1 UNION R2 is regular
b) R1 INTERSECTION R2 is regular
c) ∑ INTERSECTION R2 IS NOT REGULAR
d) R2* IS NOT REGULAR
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