SOLUTION: calculate the number of subsets for the set {9,13,5,20}

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Question 938480: calculate the number of subsets for the set {9,13,5,20}
Found 2 solutions by Alan3354, Fombitz:
Answer by Alan3354(69443) About Me  (Show Source):
Answer by Fombitz(32388) About Me  (Show Source):
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4 elements, 2%5E4 or 16 subsets.