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 Youtube Permutations and Combinations lesson 1 - The Addition Principle 
 Youtube Permutations and Combinations lesson 2 - The Multiplication principle
 Youtube Permutations and Combinations lesson 3 - Rearranging objects
 Youtube Permutations and Combinations lesson 4 - Permutations without repetition
 Youtube Permutations and Combinations lesson 5 - Permutations with repetition
 Youtube Permutations and Combinations lesson 6 - Combinations (or subsets)
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