Plot summary
The death of a Chinese interpreter outside a nightclub who was knocked down and fatally injured by a car at first appears to be an accident but Charlie's theory later suggests that it was murder and the resulting investigation leads Don and his team to investigate a possible mole from within the Department of Justice. Colby covers up information on Don's case for a friend ( Shawn Hatosy ) and is left stunned when he finds evidence suggesting that his old friend is the mole that Don and the team are looking for. Charlie is upset when Larry publishes a paper without his help. Mathematics used: Steady Motion Algorithm, Curtate cycloid, symmetry and combinatorics
Credits
Adapted from Wikipedia contributors, Numbers season 3. HTML formatting and reference markers removed.