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#