This is not a legitimate question. However, based on assumptions I guess the answer that you are looking for is heterogeneous mixtures.
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7*3*4 = 84 combinations.
8C6 = 28
The number of combinations of six numbers that can be made from seven numbers will depend on if you can repeat numbers. In all there are over 2,000 different numbers that can be made.
120
You can choose 5 different hats and for each of them 4 different sunglasses can be chosen, giving 5 x 4 = 20 different combinations.