Skip to page content
Permutations and Combinations
Mathematics · Chapter 8 · Unit 2: Algebra
Not started Not started
Your path through this chapter
Visual lesson Coming soon
Short slides, one idea at a time. We are preparing this chapter's lesson.
Notes Coming soon
Clear chapter notes for quick revision.
Flashcards Coming soon
Quick recall of key terms and facts.
Practice Coming soon
Board-style questions with instant checks.
Chapter test Free
Short and long chapter tests in board pattern, with results and analysis.
Step 5: Not started
Topics 5
- Fundamental principle of counting; factorial notation n! = n(n - 1)!
- Permutations nPr (derivation); restricted permutations: items always together or never together; forming numbers from digits
- Word building with and without repeated letters; permutations of alike and repeated things; circular permutations
- Combinations nCr (derivation) and properties: nCr = nC(n - r), (n+1)Cr = nC(r-1) + nCr; selections of different and of alike things
- Mixed problems on permutations and combinations