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c use a proof by contradiction to prove that for...

Question: c use a proof by contradiction to prove that for...

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(c) Use a proof by contradiction to prove, that for all real numbers a and b if ab 1/2 then a2 + ab > _2 b2 > 1 . or (d) Provide a counterexample to disprove, that for all real numbers z if 2-20 then 2 21/2 No explanation is needed for how the countererample uas found. Make sure to provide a verification that the countererample is correct.)

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