Question

If U= {1,3,9,11,13,18,19,20,21} & B= {3,9,11,13}, A= {1,3,9} then find A' and B'.​

Answer 1

Step-by-step explanation:

A'={11,13,18,19,20,21} B`={1,18,19,20,21}

dash sets are those sets which do not have the numbers that set A has

Answer 2

Answer:

Step-by-step explanation:

A'={1,3,9,11,13,18,19,20,21}-{1,3,9}

  ={11,13,18,19,20,21}

B'={1,3,9,11,13,18,19,20,21}-{3,9,11,13}

  ={1,18,19,20,21}

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