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1 Answer
Shwetank Mauria
Mar 13, 2018

First choice, namely (AuuB)^c

Explanation:

As A={1,3,6,9,12,15,18} and B={2,9,11,20}

AuuB={1,2,3,6,9,11,12,15,18,20}

and AnnB={9}

Let C={4,5,7,8,10,13,14,16,17,19}.

It is eveident that C

  • has no element common with AuuB and
  • Cuu(AuuB)=U

Hence {4,5,7,8,10,13,14,16,17,19} is complemetary set of AuuB and answer is (AuuB)^c

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