## Permutations and Combinations Tutorial

This video tutorial focuses on permutations and combinations. It contains a few word problems including one associated with the fundamental counting principle. Permutations are useful to determine the different number of ways to arrange something where as combinations is useful for determining how many ways to combine something when the order does not matter such as selecting members to form a committee. In a permutation, the order matters. Examples include repeated symbols or arranging letters in a word such as alabama or mississippi. This video also discusses the basics of permutations and combinations using letters such as ABCD.

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could you explain the words with repeating alphabets derivations ?!! got lost there..

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U're the best teacher….but I have questions in 4:16 the P=12 but when learn in class and read books it's 24 because P(n,n) =4!/(4-4)! =4Γ3Γ2Γ1/ 1! It's equals to 24….can anyone make me get it?

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Thanks for all these videos! I do have a problem I can't figure out how to calculate. I think the combination formula applies but it's not a simple combination. So maybe someone else can help: A league needs to schedule a season of games. Each game requires 4 players. How many games must be scheduled so that 10 players appear in at least 2 games?

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While this is a truly awesome general explanation even young children can absorb, I would suggest not reducing multiplication to 1s and 0s wherever possible so that viewers can better grasp the logic behind the equations. Once they've understood the concepts they can then move on to the 0/1 multiplication/division shortcuts, such as changing units to make light years 1=1.

They'll be thrilled to learn about shortcuts, but they'll have a much deeper understanding of the logic behind it all. It's kind of like showing a kid to use a calculator or teaching her how the basic functions work. I spent hours doing long division with my daughter; she's unstoppable now. Sure, she can use a calculator. She can also do mathematics mentally, and a lot faster for most everyday sums.

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