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Set Theory
hard
0:00.0
What is
A
c
u
p
A
′
A \\cup A'
A
c
u
p
A
′
?
A
A
A
A
B
U
U
U
(Universal set)
C
e
m
p
t
y
s
e
t
\\emptyset
e
m
pt
y
se
t
D
A
′
A'
A
′
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