Paper 2 · Probability
⏱ Tested in 5+ recent exam questions
Lesson 6 of 9
Probability 6 – Combinations
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- Count selections where order doesn't matter using nCr = n!/[r!(n−r)!]
- Multiply nCr terms across groups to build teams with mixed conditions
- Answer 'at least k' and 'no more than k' questions by enumerating cases and summing
- Use the complement — total minus ineligible cases — for 'at least' shortcuts
Most recent exam questions
- 2026 P2 Q10(b)(iii)
- 2026 P2 Q5(b)(iv)
- 2026 P2 Q8(c)
- 2025 P2 Q10(c)(i) — deferred
- 2025 P2 Q10(c)(ii) — deferred
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