# If nPr =nCr..... x. ,then what is the value of x?

##### 1 Answer

Apr 19, 2018

When

#### Explanation:

I think

Where we have this relation, we have:

We can divide through by

Does this work?

Let's have a test case of

And now a test case of

And so we end up with 2 cases:

- When
#r=1, x=n# - When
#r=0, x=1#