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Let A and B be sets. If AnnX=BnnX=phi an...

Let A and B be sets. If `AnnX=BnnX=phi` and `AuuX=BuuX` for some set X then how that A=B

A

`A -B=A nnB`

B

`A=B`

C

`B-A=A nnB`

D

None of these

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The correct Answer is:
B
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