How do you solve permutation problems?

Can you explain how to solve permutation problems?

Sure! Permutation problems involve arranging items in a specific order. The formula is n!/(n-r)! for r selections.

What does n! mean in this context?

The notation n! (n factorial) means the product of all positive integers up to n. For example, 5! = 5 x 4 x 3 x 2 x 1 = 120.

Can you give me an example of a permutation problem?

Of course! If you have 3 books and want to know how many ways you can arrange them, you would calculate 3! = 6.

What if I want to arrange only 2 out of those 3 books?

In that case, you would use the formula 3!/(3-2)! = 3!/1! = 6/1 = 6. So, there are 6 ways to arrange 2 books.