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6 points are placed  on the line a, 4 points are placed on the  line b.  How many triangles is  it  possible to form such that their vertices will be the given points, if a is parallel to b?

 Aug 11, 2020
 #1
avatar+115420 
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6C2*4 + 4C2*6

 Aug 12, 2020
 #2
avatar+477 
+1

Thanks the hint helped a lot!

 Aug 13, 2020

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