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Mathematics
Problem
A man has 10 friends. In how many ways he can invite one or more of them to a party? a. 10! b.
2
10
2^{10}
2
10
c.
10
!
−
1
10! - 1
10
!
−
1
d.
2
10
−
1
2^{10} - 1
2
10
−
1
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