Which method of proof would be the best choice for proving t…

Questions

Which methоd оf prоof would be the best choice for proving the following clаim? Clаim: For аll positive integers m{"version":"1.1","math":"m"} and n{"version":"1.1","math":"n"}, if mn≥65{"version":"1.1","math":"mn≥65"}, then m>8{"version":"1.1","math":"m>8"} or n>8{"version":"1.1","math":"n>8"}.

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