This worksheet uses an ongoing theme of yellow and white counters in a bag to encourage pupils aiming for a grade 8 or grade 9 to think about how to combine their knowledge of algebraic manipulation and probability in order to solve problems. Within this worksheet, you will find four carefully designed exam-style questions, each needing to be set up and tackled in slightly different ways.

To provide additional support, we have also included a version of the worksheet with clues. This resource can be particularly beneficial for classes or individuals who may require assistance when setting up their probability trees with algebraic expressions.