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Combinatorics
easy
0:00.0
How many subsets of the set
{
x
,
y
,
z
,
w
}
\{x, y, z, w\}
{
x
,
y
,
z
,
w
}
include the element
x
x
x
?
A
4
B
8
C
12
D
16
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