SOLUTION: In a five-element set, how many subsets contain two or more elements?

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Question 429258: In a five-element set, how many subsets contain two or more elements?
Answer by sudhanshu_kmr(1152) About Me  (Show Source):
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no. of ways = 5C2 + 5C3 + 5C4 + 5C5

= 10 + 10 + 5 + 1

= 26