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Discrete Mathematics: solve the following problem using proof by contraposition or proof by contradiction or prime factorization theorem (contradiction and contraposition preferred), please show all

Discrete Mathematics: solve the following problem using proof by contraposition or proof by contradiction or prime factorization theorem (contradiction and contraposition preferred), please show all work image text in transcribed

Prove In E Z, 5|(n n)(n 4). Prove In E Z, 5|(n n)(n 4)

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