Question: Let S = { { 1 } , { 2 } , { 3 } , { 1 , 2 , 3 } } .

Let S={{1},{2},{3},{1,2,3}}. What is the cardinality of S ?
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Let S = { { 1 } , { 2 } , { 3 } , { 1 , 2 , 3 } }

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