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OpenStudy (anonymous):
How many different ways can you arrange seven people shoulder-to-shoulder in a line?
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OpenStudy (anonymous):
do you know what a factorial is?
OpenStudy (dumbcow):
the answer is 7! = 7*6*5*4*3*2*1 its the counting principal...think of the possible choices for each person you put in line initially you must choose 1 out of 7 then you pick 1 from remaining 6 then 1 from 5 and so on ... well each of those possible choices will produce a completely different arrangement
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