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OpenStudy (anonymous):
7P4
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jimthompson5910 (jim_thompson5910):
nPr = (n!)/((n-r)!) 7P4 = (7!)/((7-4)!) 7P4 = (7!)/(3!) 7P4 = (7*6*5*4*3!)/(3!) 7P4 = 7*6*5*4 7P4 = 840
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