The difference between
Combinations and
Permutations
The Mastermind by jnthnhys
Combination (224365) by Cellach

Probability and Statistics
http://www.youtube.com/watch?v=P1emX7jukq0

How many different necklaces can be made from 12
beads of different colours?

Mom and dad and their 6 children (3 boys and 3 girls)
are to be seated at a circular table. How many ways
can this be done if mom and dad sit together and the
males and females alternate?

In how many ways can the student council select 3 people to be on a
subcommittee if there are 7 people on the council.

Combinations