if each participant of a chess tournament plays exactly one game with each of the remaining participants , then 120 games will be played during the tournament . find the number of participants .
"let p be the number of participants . pc 2 = 120 ( p ) ( p - 1 ) = 240 = 16 * 15 p = 16 the answer is b ."
divide(add(sqrt(add(multiply(multiply(120, const_2), const_4), const_1)), const_1), const_2)