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http://prntscr.com/nifktq

 Apr 29, 2019
 #1
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What does that L-shaped symbol mean? It is neither "floor" nor "ceiling". Never seen it before!.

 Apr 30, 2019
 #2
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I have not seen that symbol before either but 

8C5= nCr(8,5) = 56

 Apr 30, 2019

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