ME-A1
Working with Combinatorics
Apply the multiplication principle, permutations, and combinations; expand using the binomial theorem.
Sample questions
- 1.How many ways can 8 people be seated in a row if two particular people must not sit next to each other?
- 2.Find the term independent of x in the expansion of (x + 2/x)⁶.
Exam weighting
3–5 marks.
Common student mistakes
- ·Using permutations where combinations were required (or vice versa)
- ·Forgetting to account for identical objects in permutation problems
- ·Incorrect general term index in the binomial expansion
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