1. The problem statement, all variables and given/known data A basketball coach has 10 boys and 10 girls on his roster. In how many ways can the coach partition the group of 20 into 4 teams of 5 students such that there are at least 2 boys and 2 girls on each team ? 3. The attempt at a solution I tried nCr(10,3)*nCr(10,2) + nCr(7,3)*nCr(8,2) + nCr(6,3)*nCr(4,2)=6500 I think it's correct but Im not sure. Thanks.