1 Jane wants to travel from home to the local town.
Jane can do this by train, by bus or by both train and bus.
- Give an example of a problem that Jane could be answering that would give a construction problem.
A website gives Jane all the possible buses and trains that she could use.
Jane finds 7 possible ways to make the journey.
- 2 of the 7 journeys involve travelling by train for at least part of the journey
- 6 of the 7 journeys involve travelling by bus for at least part of the journey
- Use the inclusion-exclusion principle to find how many of the 7 journeys involve travelling by both train and bus.