Let \(S = \{1, 2, 3, 4, 5, 6\}\)
How many subsets are there of cardinality 4?
How many subsets of cardinality 4 have \(\{2,3,5\}\) as a subset?
How many subsets of cardinality 4 contain at least one odd number?
How many subsets of cardinality 4 contain exactly one even number?