This tutorial explains what a factorial is, and how factorials are used in formulas to solve permutation and combination problems, sometimes called n-choose-k problems, where k items are chosen from a set of n items. The video explains what is meant by "order matters", presents three formulas for solving these problems, and works through several example problems in detail that are typical of what you would find on the ACT or SAT standardized tests.
RELATED VIDEOS:
Percents Part 1: https://youtu.be/jHLTU8mqHJ8
Percents Part 2: https://youtu.be/HJ60-_3PwVM
More Percentages: https://youtu.be/hxU252f-buI
Ratios & Proportions: https://youtu.be/81Ize04z9Rg
Probability Part 1: https://youtu.be/FnImmFUyzkA
Probability Part 2: https://youtu.be/Kddq4ID1M7s
Permutations: https://youtu.be/OcO2SgAnvhg
Standard Deviation: https://youtu.be/p5xThuN3P0I
Logarithms: https://youtu.be/FLbikXxMR0w
Exponents: https://youtu.be/V0BelPptoYA
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