Guest Session: 1 Question Remaining.
Create Account
to save progress.
Login
Set Theory
hard
0:00.0
What is
A
c
u
p
U
A \\cup U
A
c
u
p
U
?
A
A
A
A
B
U
U
U
C
e
m
p
t
y
s
e
t
\\emptyset
e
m
pt
y
se
t
D
A
′
A'
A
′
Submit Answer