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Compute P for n=8,r=4...

Compute P for `n=8,r=4`

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`n=8,r=4`
`:.""^nP_r=(n!)/((n-r)!)=(8!)/((8-4)!)`
`=(8*7*6*5*4*!)/(4!)=8*7*6*5=1680`
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