Dara O'Briain's School of Hard Sums

Guest comedians Sally Phillips and Kevin Bridges pit their muscles and common sense against the power of Dara's mathematically-trained brain as they battle it out to solve puzzles and problems set by Professor Marcus du Sautoy. Today's theme is, 'The Maths of Sport'.

Guest comedians Jon Richardson and Stephen K Amos pit their brute strength and common sense against Dara's mathematically-minded brain as they battle it out to solve puzzles and problems set by Professor Marcus du Sautoy. Today's theme is, 'The Maths of Old Age'.

Guest comedians Susan Calman and Andrew Maxwell pit their muscles and common sense against Dara's big maths brain as they battle it out to solve puzzles and problems set by Professor Marcus du Sautoy. Today's theme is: 'The Maths of Balls'.