Ask prawns three probability questions!

1. There are more heads than tails: that is to say, there are 6 7 8 9 10 heads, and it doesn't matter when they are thrown, so P = c106+c107+c108+009+c.

Team A has at least two weak teams: that is, there are two or three weak teams. After the weak team is selected, other teams in Group A are selected, so P=C3 2*C5 2+C3 3*C5 1.

The third question is more complicated and there is no time. Continue tomorrow ~