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Combinatorics
hard
0:00.0
What is the number of onto functions from
{
1
,
2
,
3
}
\{1, 2, 3\}
{
1
,
2
,
3
}
to
{
1
,
2
}
\{1, 2\}
{
1
,
2
}
?
A
2
B
4
C
6
D
8
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