there are 10 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 ?
"10 players are there . two players play one game with one another . so 10 c 2 = 10 * 9 / 2 = 45 so option c is correct"
divide(multiply(10, subtract(10, const_1)), const_2)