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1)show that {xcx^R | x {a,b}*} is not regular(pumping lemma) 2)Let A = {a^nb^2n| n>=0}. Using the pumping lemma for regular language, prove that A

1)show that {xcx^R | x {a,b}*} is not regular(pumping lemma)

2)Let A = {a^nb^2n| n>=0}. Using the pumping lemma for regular language, prove that A is not regular.

3)let E= {a^nb^m|m>=n}. using the pumping lemme for regular languages , prove that E is not regular

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