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Question

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

a.

R1 UNION R2 is regular

b.

R1 INTERSECTION R2 is regular

c.

∑ INTERSECTION R2 IS NOT REGULAR

d.

R2* IS NOT REGULAR

Answer: (a).R1 UNION R2 is regular

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