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30C5

 Oct 5, 2016
 #1
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30C5 =30! / (30-5)!. 5! =142,506

 Oct 5, 2016
 #2
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30C5

 

30C5=(305)=30!(305)!5!=30!25!5!=25!262728293025!5!=26272829305!=305294283272261=305291284273262=6297913=142506

 

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 Oct 5, 2016

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