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If AΔB=AB then

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a
A=B
b
A∩B=ϕ
c
AΔB=ϕ
d
AΔB=A~B

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detailed solution

Correct option is B

A∪B=AΔB∪(A∩B)So A∪B=A△B⇒A∩B=ϕ.

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