a. Let C be a context-free language and R be a regular

Chapter , Problem 2.18

(choose chapter or problem)

a. Let C be a context-free language and R be a regular language. Prove that the language C R is context free. b. Let A = {w|w{a,b,c}and w contains equal numbers of as, bs, and cs}. Use part (a) to show that A is not a CFL.

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