there are 15 players in a chess group , and each player plays each of the others once . given that each game is played by two players , how many total games will be played ?
15 players are there . two players play one game with one another . so 15 c 2 = 15 x 14 / 2 = 105 so option c is correct
divide(multiply(15, subtract(15, const_1)), const_2)