SOLUTION: a set has 9 elements a) how many subsets does it have? b) how many proper subsets does it have? so confused please help

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Question 84874: a set has 9 elements
a) how many subsets does it have?
b) how many proper subsets does it have?
so confused please help
Answer by rapaljer(4551) About Me  (Show Source):
You can put this solution on YOUR website!
The number of subsets is always 2 raised to the power of the number of elements in the set. In this case, the answer is 2%5E9=512.

The number of proper subsets is always 1 less than the number of subsets, since a proper subset is any subset except the set itself! In this case, the answer is 2%5E9-1=512-1=+511.

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