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?  Choose the correct answer.
A) 10  B) 30  C) 45  D) 60  E) 90

Rationale: "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"
Answer: C