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 3
matches are totally played, how many teams participated?	Choose the correct choice from the following answers
A) 4
B) 5
C) 6
D) 7
E) 3
2 ways to solve this problem..   summation(x)=n(n-1)/2   n(n-1)/2=3;   n^2-n-6=0   Ans : 3   ANSW3R:3
<result>E</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 3
matches are totally played, how many teams participated?