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

Enrich 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)!)

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