1. Computer Science Engineering (CSE)
  2. Theory of Computation
  3. Unit 1
  4. P, Q, R are three languages. If P & R ar...
Q.

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» C. Q need not be regular
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