4. Permutations & Combinations
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4.01 Introducing Factorials
4.01 Introducing Factorials
4.02 A Password with 6 letters: How many arrangements?
4.02 A Password with 6 letters: How many arrangements?
4.03 Permutations and Combinations - what's the difference?
4.03 Permutations and Combinations - what's the difference?
4.04a Permutations: Allowing Repetition
4.04a Permutations: Allowing Repetition
4.04b Permutations: Not allowing Repetition
4.04b Permutations: Not allowing Repetition
4.05 Permutations: Introducing nPr
4.05 Permutations: Introducing nPr
4.06 An Example of using nPr
4.06 An Example of using nPr
4.07 A Password with 3 letters and 4 numbers: How many arrangements?
4.07 A Password with 3 letters and 4 numbers: How many arrangements?
4.08 Introducing Combinations
4.08 Introducing Combinations
4.09 Combinations: Introducing nCr
4.09 Combinations: Introducing nCr
4.10 An Example of using nCr
4.10 An Example of using nCr
4.11 A Second Example of using nCr
4.11 A Second Example of using nCr
4.12 Permutations and Combinations: An Exam-Style Question
4.12 Permutations and Combinations: An Exam-Style Question