Eight teams are regarded as eight colored balls with completely different colors, and two balls are placed in four glass jars, which is equivalent to randomly selecting two balls from eight balls, randomly placing one glass jar, then randomly selecting two balls from the remaining six balls and placing another glass jar.
In the order of glass jars, there are C8, 2×C6, 2×C4, 2×C2, 2 (there is something wrong with this writing, because I don't have professional mathematical software, and everyone who has studied permutation and combination knows what I mean) =28× 15×6× 1=2520.
meaning
The draw for the quarterfinals will be held on Friday night, Beijing time. There is no evasion rule in this lottery, and there will be a clear division between the upper and lower areas, that is, all teams will know the potential semi-finals and finals.
The Champions League quarter-finals will no longer consider "avoidance in the same country and group", and the whole draw will be completely random, including the home and away order. The draw for the Champions League14 final will clearly divide the upper and lower half, that is, all teams will know the potential semi-finals and finals. There will be no rules to avoid the same country and seed team in this lottery. The team that draws the first place will play at home first.