How do you evaluate #color(white)()^7 P_3# ?

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Tony B Share
Aug 5, 2016

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#210#

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Written as #color(white)()^7P_3 larr" Permutation"#

Standard form #color(white)(.)^nP_r =(n!)/((n-r)!)# giving

#(7!)/((7-3)!) = (7xx6xx5xxcancel(4!))/(cancel(4!))#

#=210#

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