Question 409514: Compute P9,9
Answer by jim_thompson5910(35256)   (Show Source):
You can put this solution on YOUR website! Use the formula P(n,r) = (n!)/((n-r)!) to get
P(9,9) = (9!)/((9-9)!)
P(9,9) = (9!)/(0!)
P(9,9) = (9!)/1
P(9,9) = 9!
P(9,9) = 9*8*7*6*5*4*3*2*1
P(9,9) = 362880
Note: P(x,x) = x! for all nonnegative integers x
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Jim
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