. group of children consists of n girls and 6 boys (6 points): 2.1. If there are 150 ways to choose two girls and two boys (order does not matter), how many girls are there in the group|? 2.2. Now we know how many girls and boys in the group. In this group, how many ways to choose two children of the same gender (order does not matter)? 2.3. In this group, how many ways to choose two children of different genders (order does not matter)? 2.4. In this group, how many ways to choose two children of different genders (order matters}? 2.5. In this group, how many ways to arrange the children in a line? 2.6. How many fourperson teams are there that consist of at least one girl