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- VI.[15] Let the Universal set be the set R, of all real numbers. [ Hint: Use real number line to represent each set then answer parts a, b and c] A = {x eR|-3Please help2 if f) = k x?, -15. Let A = 2N = {2,4,6, 8, ...} and B = [0, 1]. Prove that |A| < |B|.How do we prove the following by doing a direct proof? " Let a ∈ Z. Prove that if 3|2a, then 3|a."Suppose that S is not an empty set, and is a set of real numbers bounded below. Let A-1 be the set of all numbers x-1 with x ∈ A.Prove that infA = -sup(A-1). (<---The negative sign before the word sup means inverse)PS: inf means least upper bound and sup means the greatest lower bound.Recommended textbooks for youAdvanced Engineering MathematicsAdvanced MathISBN:9780470458365Author:Erwin KreyszigPublisher:Wiley, John & Sons, IncorporatedNumerical Methods for EngineersAdvanced MathISBN:9780073397924Author:Steven C. Chapra Dr., Raymond P. CanalePublisher:McGraw-Hill EducationIntroductory Mathematics for Engineering Applicat…Advanced MathISBN:9781118141809Author:Nathan KlingbeilPublisher:WILEYMathematics For Machine TechnologyAdvanced MathISBN:9781337798310Author:Peterson, John.Publisher:Cengage Learning,Advanced Engineering MathematicsAdvanced MathISBN:9780470458365Author:Erwin KreyszigPublisher:Wiley, John & Sons, IncorporatedNumerical Methods for EngineersAdvanced MathISBN:9780073397924Author:Steven C. Chapra Dr., Raymond P. CanalePublisher:McGraw-Hill EducationIntroductory Mathematics for Engineering Applicat…Advanced MathISBN:9781118141809Author:Nathan KlingbeilPublisher:WILEYMathematics For Machine TechnologyAdvanced MathISBN:9781337798310Author:Peterson, John.Publisher:Cengage Learning,