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Same cardinality? Suppose we have two sets and we are able to pair elements from one set with elements from the other set in such a way that all the elements from the first set are paired with elements from the second set; but there are elements from the second set that were never paired. Does this pairing imply that the two sets do not have the same cardinality? Justify your answer.
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The Heart of Mathematics: An Invitation to Effective Thinking, WileyPLUS NextGen Card with Loose-leaf Set Single Semester: An Invitation to Effective Thinking (Key Curriculum Press)
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