Permutations (HSC SSCE Mathematics Extension 1): Flashcards

An order-specific arrangement of objects.

The formula is n! / (n - r)! for r selections.

5! = 120 arrangements.

In permutations, order counts; in combinations, it doesn't.

Calculate 3! = 6 arrangements.

Permutations with specific conditions or limitations.

Treat OO as one unit: 3! = 6, then 6 x 2! = 12.

Use (n-1)! for circular arrangements.

Use n! divided by the factorials of repeats.

Calculate using 10P3 = 720 arrangements.