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'.

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'.