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Cardinality of Sets

If A=1,2,2,1,...

Question

If $A = {1, 2, 2, 1, 3, 4, 3, 4}$ , then $n (A) =$

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Solution

$A = {1, 2, 3, 4} \Rightarrow n (A) = 4$

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Cardinality of Sets

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