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Let \(S = \{1, 2, 3, 4, 5, 6\}\)

  1. How many subsets are there of cardinality 4?

  2. How many subsets of cardinality 4 have \(\{2,3,5\}\) as a subset?

  3. How many subsets of cardinality 4 contain at least one odd number?

  4. How many subsets of cardinality 4 contain exactly one even number?

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