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Set Theory
hard
0:00.0
Find
n
(
A
t
i
m
e
s
A
)
n(A \\times A)
n
(
A
t
im
es
A
)
if
A
=
1
,
2
A = \\{1, 2\\}
A
=
1
,
2
.
A
2
B
4
C
8
D
1
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