It's true, a couple has two boys and is expecting a third child. The probability that the third child will be a boy is ½.
Probability is an area of mathematics that deals with numerical descriptions of how probable an event is to occur or how likely a statement is to be true. The probability that something will happen is a number between 0 and 1, where 0 denotes the event's impossibility and 1 represents certainty.
The product rule, which states that the likelihood of two (or more) independent occurrences occurring together may be estimated by multiplying the individual probabilities of the events, is a very helpful probability rule in genetics.
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