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Set Theory
medium
0:00.0
Find
n
(
A
−
B
)
n(A-B)
n
(
A
−
B
)
if
n
(
A
)
=
20
n(A)=20
n
(
A
)
=
20
and
n
(
A
c
a
p
B
)
=
5
n(A \\cap B)=5
n
(
A
c
a
pB
)
=
5
.
A
15
B
25
C
5
D
10
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