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6. (a) Prove by contrapositive: If the product of two natural numbers is greater than 100,...

6. (a) Prove by contrapositive: If the product of two natural numbers is greater than 100, then at least one of the numbers is greater than 10. (b) Prove or disprove: If the product of two rational numbers is greater than 100, then at least one of the numbers is greater than 10.

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