A bag holds 3 red balls, 5 blue balls and 2 yellow balls. What is the chance of drawing a yellow ball?

1. Every ball is equally likely to be drawn, so outcomes can simply be counted. 2. Count the sample space first: 3 plus 5 plus 2 gives 10 balls in total. 3. Count the event set next: there are 2 yellow balls. 4. The probability is 2 out of 10, which simplifies to 1 out of 5. 5. Answering 1 in 10 counts only one yellow ball instead of both of them. _Source: Siyavula Mathematics Grade 11 (Everything Maths, CC BY 4.0), Chapter 10: Probability_