how to find these sets?

Question

U= {a,b,c,d,e,f,g}

A= {c,d,e,f}

B= {d,e,g}

what is:

1. A'

2. B'

3. A∪B'

4. B∩C'

Answer 1

1.A'=U-A={a,b,g}

2.B'=U-B={a,b,c,f}

3.A union B'={a,b,c,d,e,f}

4.What is the set C' that you mention? It is not defined anywhere.