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**A-Level** **Mathematics**** Question Analysis Topic: Mathematics - Probability**

**Exam Question: **

In a family of 3 children, the probability of having at least one boy is..

**Answer:**

For A-Level Mathematics, you should know:

Given: There are three children in the family.

As such, the total number of outcomes is **2**^{3}** = 8**.

Number of favourable cases:

A favourable case means **at least one** of the children in the family is a **boy**.

In other words, the eight possible combinations are:*BBB, BBG, BGB, BGG, GBB, GBG, GGB *and* GGG*.

Looking at the above combination, we know that the probability of having at least one boy is **7/8**.

Work hard for your A-Level Mathematics examination!

End of analysis. Great!