This challenging activity is designed to be accessible to students of A-Level Maths (Key Stage 5).

Detailed teachers' notes for this activity are available on our NRICH website.

Further reading

Our article Anyone for tennis (and tennis and tennis...)? investigates the probabilities involved in the epic Isner-Mahut match at Wimbledon in 2010.

You can find detailed teachers' notes for this activity on our NRICH website, where you can also find thousands more mathematical resources including problems, investigations and games for all ages from 5 to 19.