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Operations on Sets
Question
If
A
∆
B
=
A
∪
B
then
Moderate
A
A
=
B
B
A
∩
B
=
∅
C
A
∆
B
=
∅
D
A
∆
B
=
A
~
B
Solution
A
∪
B
=
A
Δ
B
⇒
A
∩
B
=
ϕ
.
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