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((x!/(3!(x-5)!)*((5!(x-7)!)/x!=10/3

 Dec 14, 2016
 #1
avatar+12531 
+5

((x!/(3!(x-5)!)*((5!(x-7)!)/x!=10/3

laugh

 Dec 14, 2016
 #2
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Brilliant Omi67!!.

 Dec 14, 2016

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