If the set has 39 elements, then there are several non empty proper subsets. Remember that there is a formula, what is it?

The formula is 2 ^ n-2
So it's 2 to the 39th power - 2
Subsets are n-th power of 2
The proper subset is n-1 of 2
To get rid of nonempty proper subsets, the number of nonempty subsets is n-th power of 2

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