Question 1177997: P(n,n-1)=6
Answer by greenestamps(13200)   (Show Source):
You can put this solution on YOUR website!
By definition, P(n,n)=n!
P(3,3) = 3*2*1 = 3!
P(5,5) = 5*4*3*2*1 = 5!
etc...
What about P(n,n-1)?
P(3,2) = 3*2 = 6 = 3!
P(5,4) = 5*4*3*2 = 120 = 5!
etc...
The only difference between P(n,n-1) and P(n,n) is an additional factor of 1, which of course doesn't change the result.
So P(n,n-1) = n!
Then your problem is to solve
P(n,n-1) = 6 = n!
By inspection, n = 3.
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