Determine the cardinality of each of the sets, A, B, and C defined below, and prove the cardinality of any set that you claim is countably infinite. A is the set of negative odd integers B is the set of positive integers less than 1000 C is the set of positive rational numbers with numerator equal to 1
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, since the number of negative odd integers is infinite.
, since there are infinitely many positive rational numbers with numerator equal to 1