Ononot — Consider the set S = \{1, 2, 3, 4, 5, 6, 7, 8\}. How many su

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Combinatoricshard

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Consider the set $S = \{1, 2, 3, 4, 5, 6, 7, 8\}$ . How many subsets of $S$ contain at least two elements whose sum is 9?