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Set Theory
hard
0:00.0
What is
A
c
a
p
e
m
p
t
y
s
e
t
A \\cap \\emptyset
A
c
a
p
e
m
pt
y
se
t
?
A
A
A
A
B
e
m
p
t
y
s
e
t
\\emptyset
e
m
pt
y
se
t
C
U
U
U
D
0
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