there are 16 teams in a tournament . if during the first round , each team plays every other team exactly once , how many games will be played in the first round ?
number of ways to pick 2 teams from a total of 16 = 16 c 2 = 16 ! / 14 ! * 2 ! = 120 . hence c .
divide(factorial(16), multiply(factorial(subtract(16, const_2)), factorial(const_2)))