Question 555238
P(n,r) = (n!)/((n-r)!)


P(7,5) = (7!)/((7-5)!)


P(7,5) = (7!)/(2!)


P(7,5) = (7*6*5*4*3*2!)/(2!)


P(7,5) = 7*6*5*4*3


P(7,5) = 2520



So there are 2,520 ways.


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