Question 1120896
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The set has 9 elements; the number of subsets is 2^9 = 512.<br>
I see no use in the exercise of listing them all....<br>
Note there will be....
9C0 = 1 subset with 0 elements
9C1 = 9 subsets with 1 elements
9C2 = 36 subsets with 2 elements
9C3 = 84 subsets with 3 elements
9C4 = 126 subsets with 4 elements
9C5 = 126 subsets with 5 elements
9C6 = 84 subsets with 6 elements
9C7 = 36 subsets with 7 elements
9C8 = 9 subsets with 8 elements
9C9 = 1 subset with 9 elements