SOLUTION: how would i do this? Indicate the formula for the following conditions. P(n,r)=

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Question 146144: how would i do this? Indicate the formula for the following conditions.
P(n,r)=
Answer by solver91311(24713) About Me  (Show Source):
You can put this solution on YOUR website!
P%5Bn%2Cr%5D=n%21%2F%28n-r%29%21 where n%21=n%2A%28n-1%29%2A%28n-2%29...3%2A2%2A1

Example: Permutations of 6 things taken 4 at a time. P%5B6%2C4%5D=6%21%2F%286-4%29%21=%286%2A5%2A4%2A3%2A2%2A1%29%2F%282%2A1%29=720%2F2=360