P, Q, R are three languages. If P & R are regular and if PQ=R, then – McqOptions

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1.	P, Q, R are three languages. If P & R are regular and if PQ=R, then
A.	Q has to be regular
B.	Q cannot be regular
C.	Q need not be regular
D.	Q has to be a CFL
Answer» D. Q has to be a CFL

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