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**Discrete Math "Proper Subsets"**

Hey everyone, I am confused on part of this. Any input would be much appreciated!!

X has ten members. How many members does ~P(X) have? (~P is the set of all subsets)

How many proper subsets does X have?

Well the number of members of ~P is 2^10 or 1024. This is the number of members in the set of subsets.

What I'm confused about is how many proper subsets does X have?