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what is the cardinality of A=(even numbers between 2and4)?​

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Answer:

Definition 1: |A| = |B|

For example, the set E = {0, 2, 4, 6, ...} of non-negative even numbers has the same cardinality as the set N = {0, 1, 2, 3, ...} of natural numbers, since the function f(n) = 2n is a bijection from N to E

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