The diagram given below consist of seven line segments and six circles,place the numbers 1 to 13 on either a line or a circle in such a way that the numbers on each segment is the difference of the two at its end points.




Here is the diagram you sent.

I realized that 13 must go in a circle so I tried

From this start I generated 4 solutions and I am sure there are many more.

Stephen La Rocque >