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prove that if a set A is countably infinite and B is a superset of A,...

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Advance Math

prove that if a set A is countably infinite and B is a superset ofA, then prove that B is infinite

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Define for any where is the setof all natural numbersRecall that a set S is called a finite set if there existsbe such there is a bijection betweenS and and a setis called an    See Answer
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