Combinations Question Help (Please provide explanation)
A drama club is putting on two plays. There are 11 actors in the Oz play and 7 in the
- a) If 3 actors are in both plays, how many actors are there in all?
b) Use a Venn diagram to calculate how many students are only in one of the two plays.
Please explain for each scenario, I don't understand the answers to these, what is the reason??