If you divide 6! by 4! you are evaluating p(6, 4)

When you're evaluating P(n, k), you are essentially saying there are n objects and you will need to arrange them in k spaces.

This is essentially the same as: , which follows the formula:


If you're dividing by 4!, you are evaluating P(6, 2)

Think of it as five or above give it a shove. change the 5 or above to the right to a zero and add one to the number on the left.