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1. \(2^6 = 64\) subsets. We need to select yes/no for each of the six elements.

2. \(2^3 = 8\) subsets. We need to select yes/no for each of the remaining three elements.

3. \(2^6 - 2^3 = 56\) subsets. There are 8 subsets which do not contain any odd numbers (select yes/no for each even number).

4. \(3\cdot 2^3 = 24\) subsets. First pick the even number. Then say yes or no to each of the odd numbers.