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OpenStudy (anonymous):
In how many ways can seven books be lined up on a shelf? a.42 b.84 c.5040 d.823,543
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OpenStudy (mathstudent55):
You have seven positions. How many books can you choose from for the first position (leftmost)? |dw:1375236648596:dw|
OpenStudy (uri):
I think it would be 7! =7*6*4*3*2*1=5040
OpenStudy (anonymous):
thanks @uri
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