How many different ways ou arrange 13 items?

The number of different ways to arrange 13 items is calculated using the factorial of 13, denoted as 13!. This is equal to 13 × 12 × 11 × ... × 3 × 2 × 1, which amounts to 6,227,020,800 different arrangements. Thus, there are 6,227,020,800 unique ways to arrange 13 items.