Be familiar with the difference between the concepts of permutations and combinations:
Permutations=arranged in a particular order
Combinations=grouped with no particular order
http://www.mathsisfun.com/combinatorics/combinations-permutations.html
https://www.khanacademy.org/math/precalculus/prob_comb/combinatorics_precalc/v/permutations-and-combinations-1
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