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A-B= phi iff...

`A-B= phi` iff

A

A = B

B

`A sube B`

C

`B sube A`

D

`A = B = phi`

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The correct Answer is:
B
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MCGROW HILL PUBLICATION-SETS, RELATIONS AND FUNCTIONS-QUESTIONS FROM PREVIOUS YEAR.S B-ARCHITECTURE ENTRANCE EXAMINATION PAPERS
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