Question

Let A = {Dirk, Johan, Frans, Sarie}, B = {Frans, Sarie, Tina, Klaas, Henrika}, C = {Hans, Frans}. Find the number indicated.

Answer 1

Thank you for posting your question here at brainly. I assume the question should be "Find the number indicated". below is the answers:

B U C means B union C which combines them: 
{Frans, Sarie, Tina, Klaas, Henrika, Hans} note that there is no need to write Frans twice. 

∩ means intersection which is only what the two sets have in common, in this case: 
{Frans, Sarie} 

the number is 2.