If Busi has 3 children what is the probability that at least one will be a girl?
Imagine tossing a coin three times.
What’s the probability you will get a head on at least one of the tosses?
What is the connection between the questions?
How could you work out the probability of Busi having 3 boys?
What do you notice about the probabilities of having at least one girl and having 3 boys?
Thank you to NRICH for the idea for this problem. You will find similar problems on the NRICH website.