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Set Theory
hard
0:00.0
How many proper subsets does a set of
n
n
n
elements have?
A
2
n
2^n
2
n
B
n
n
n
C
2
n
−
1
2^n - 1
2
n
−
1
D
2
n
−
1
2^{n-1}
2
n
−
1
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