GRE Math: Permutations Vs. Combinations
The main complaint I hear regarding combinatorics - that is, permutation and combination questions - is "what the hell am I looking at? Which one is it?" It can be hard to decipher whether the question involves a permutation - in which order matters - or a combination - in which order does NOT matter.
In this brief video, I cover some tips about how to tell the difference between permutations and combinations as they appear on GRE quantitative sections.
If you liked this video, check out my other free GRE resources.