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Let A be the set {0,1,2,3,4,5,6,7,8,9}. 1. How many non-empty subsets of A have a cardinality of at least 6 ? 2. How many non-empty

Let A be the set {0,1,2,3,4,5,6,7,8,9}. 1. How many non-empty subsets of A have a cardinality of at least 6 ? 2. How many non-empty subsets of A have a cardinality of 4 or less? 3. How many non-empty subsets of A have a cardinality between 4 and 7 (inclusively)

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