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Question

P, O, R be regular expression over ∑, P is not ε, then
R=Q + RP has a unique solution:

a.

Q*P

b.

QP*

c.

Q*P*

d.

(P*O*) *

Answer: (b).QP*

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Q. P, O, R be regular expression over ∑, P is not ε, then R=Q + RP has a unique solution:

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