<span>You will need to weight those balls only twice.
You weight 6 balls, 3 on one side of weight and 3 on another, and other
3 balls you have are in your hand.
Check picture bellow</span>
Check picture bellow</span>
The coordinates of the vertices for figure HIJK are H:(0,5) I:(3,3) J:(4,-1) and K:(1,1)
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