A set of football matches is to be organized in a "round-robin" fashion, i.e., every
participating team plays a match against every other team once and only once. If 2
matches are totally played, how many teams participated? Choose the correct choice from the following answers: A) 4 B) 5 C) 6 D) 2 E) 3
2 ways to solve this problem..   summation(x)=n(n-1)/2   n(n-1)/2=2;   n^2-n-4=0   Ans : 2   ANSWER:2
<result>D</result>
A set of football matches is to be organized in a "round-robin" fashion, i.e., every
participating team plays a match against every other team once and only once. If 2
matches are totally played, how many teams participated?