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?
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This problem is adapted from the NRICH task At Leat One with permission of the University of Cambridge. All rights reserved.