Videociencia 2018: How many couples can you do with 25 people?

Pablo López Igualada, Samuel Plaza Sáez and David Baena Sánchez,  3ºD.

-We're going to explain how many couples can we do with 25 people,   finding out how many couples can do each person.

-The first person can make 24 couples, the second 23, the third 22...