Support · Mathematics Extension 1 11–12 – Year 11 · Permutations and combinations

Support Use the multiplication principle to establish that the number of ordered selections of r objects from n distinct objects is n(n - 1)(n - 2) × … × (n - r + 1) and show that ⁿP_r = n(n - 1)(n - 2) × … × (n - r + 1) = (n!)/((n - r)!)

Resources for the prerequisite content of this dot point: earlier-stage (or earlier sub-level) dot points in the same strand that students usually need first. Use these to fill gaps before or alongside the core lesson.

Prerequisite links are draft mappings generated from the syllabus structure (earlier stage, same strand, closest content). They are being reviewed by teachers. Spot a poor match? Tell us.

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Prerequisite dot points