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

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Jan 22, 2018

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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:

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