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Mathematics, 03.09.2021 14:00 gwendallinesikes

Determine whether the biconditional statement is true or false. If false, give a counterexample. The number k is a positive integer if and only if 5k is a natural number.

A. true
B. false; 5k = 1, then k = −1/5, which is not a positive integer
C. false; 5k = 25, then k = 5 which is not a positive integer
D. false; 5k = 1, then k = 1/5, which is not a positive integer

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