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27!/(27-4)!4!

 Mar 15, 2017
 #1
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{27 x 26 x 25 x 24 x 23..........} / {23! x 4 x 3 x 2 x 1} =17,550

 Mar 15, 2017
 #2
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Thank you 

 Mar 15, 2017

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