SOLUTION: From a set of 5 elements,how many subsets with at least one element can be formed?

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Question 1088160: From a set of 5 elements,how many subsets with at least one element can be formed?
Answer by ikleyn(52879) About Me  (Show Source):
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2%5E5+-+1 = 32 - 1 = 31 subsets.


For the set with n elements the answer is 2%5En-1 subsets.

See the lesson
    - How many subsets are there in a given finite set of n elements?
in this site.