There are 20 students in the class. Each of them is dedicated to one sport activity:
10 students are runners,
7 are cyclists
in 3 are swimmers.
We bring three students together in a group.
How many different groups of three students can we put together?
How many different groups of three runners can we put together?
In how many selections is each sport represented?
How many groups of three can we have if there will be at least one rider in each group?
