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Let A and B be two non-empty subsets of ...

Let A and B be two non-empty subsets of a set X. If `(A-B)uu(B-A)=AuuB`, then which one of the following is correct?

A

` A sub B `

B

` A sub ( X - B) `

C

` A = B `

D

` B sub A `

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The correct Answer is:
B
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