# Solving Permutations and Combinations.Solving for variable.Find the value of r in 6Pr = 30?

##### 1 Answer

Jan 18, 2018

#### Explanation:

For this problem, I will use the simplest way possible to solve this.

Remember that:

For

Using the fact that

Where

Therefore,

Which means that

Now, we try to think of our basic factorial numbers.

Oh!

We can now solve the equation: