Place numbers from $1$ to $9$ in the circles of the figure (see Fig. ) so that the sum of four numbers, finding located in the circles at the tops of all squares (there are six of them), was constant ,
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Tags: combinatorics
Place numbers from $1$ to $9$ in the circles of the figure (see Fig. ) so that the sum of four numbers, finding located in the circles at the tops of all squares (there are six of them), was constant ,
