Question: i . Define the complexity class Co NP . ( 2 marks ) ii . Prove that if Y < = P X and X

i. Define the complexity class CoNP.(2 marks)
ii. Prove that if Y <=P X and X in CoNP then Y in CoNP.(4 marks)
iii. Hence prove that if X is an NP-complete problem and X in CoNP then NP =
CoNP.

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