there are 7 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 ?
"7 players are there . two players play one game with one another . so 7 c 2 = 7 * 6 / 2 = 21 so option a is correct"
divide(multiply(7, subtract(7, const_1)), const_2)