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[Event] [Winners] How Many Do You See?

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Posted on 1/4/16 2:05:16 PM | Show thread starter's posts only

Congratulations to the Winners!!

Here is how to solve that problem with math
1. see there are 9 line in total every 3 lines can form a triangle,  so the total triangle that 9 lines may form 
is 9 * 8 * 7 /3/2 = 84
2.  but the lines coming out from the same vertex cannot form a triangle each vertex having 4 lines coming
 out if we pick 3 lines out of 4, the possible combinations is 4 and there are 3 vertices, so we need to 
subtract 3 * 4 = 12 from all the possible combinations result is 84 - 12 = 72

Easy, huh :D

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Prizes will be sent within 5-7 days

Posted on 1/10/16 3:16:01 AM | Show thread starter's posts only

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