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Set Theory
hard
0:00.0
If
A
=
∅
A = \emptyset
A
=
∅
, what is
A
×
B
A \times B
A
×
B
?
A
{
∅
}
\{ \emptyset \}
{
∅
}
B
∅
\emptyset
∅
C
B
B
B
D
{
B
}
\{B\}
{
B
}
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