It is: 15C7 = 6435 combinations
20C2 = 190
72
Because you are better that the others.
A Republic - where individuals are chosen by the people to represent them and the group of individuals so chosen make the decisions as a group.
84 = 9 choose 3 = 9! / 3! / (9-3)!
I've discussed this in class with my teacher. I believe it is true, but too controversial for many people to admit it.
15
if in a class pupil 47 is opposite pupil 16 when the group is seated in a circle how many students are in the PE class?
The answer depends on how many are chosen at a time.
There are a great many different things that could be considered the class. The class could be considered a group of children.
it is a combination: 9!/4!=9 x 8 x 7 x 6
2 or 3