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    				| 1. | 
                                    Compute P for n=8,r=4 | 
                            
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Answer» Solution :`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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