Seven teams play a soccer tournament in which each team plays every other team exactly once. No ties occur, each team has a \(50\%\) chance of winning each game it plays, and the outcomes of the games are independent. In each game, the winner is awarded a point and the loser gets 0 points. The total points are accumulated to decide the ranks of the teams. In the first game of the tournament, team \(A\) beats team \(B.\) The probability that team \(A\) finishes with more points than team \(B\) is \(m/n,\) where \(m\) and \(n\) are relatively prime positive integers. Find \(m+n.\)
(第二十四届AIME2 2006 第10题)