there are 30 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 ?
"30 players are there . two players play one game with one another . so 30 c 2 = 30 * 29 / 2 = 435 so option c is correct"
divide(multiply(30, subtract(30, const_1)), const_2)