4 MathJax formatting edit approved Sep 22 '15 at 17:12 grg 20933 silver badges66 bronze badges In a 3x3 grid, I'd have to put numbers from 1 to 9 in a manner so that respective row, column and diagonal add up to 15. I have only been able to come up with one solution: 6 1 8 7 5 3 2 9 4 $$\begin{array}{ccc} 6 & 1 & 8 \\ 7 & 5 & 3 \\ 2 & 9 & 4 \end{array}$$ Through some calculations and trial and error method. Is there any strategy or way of approach to this problem, or is trial and error method the solution to it? In a 3x3 grid, I'd have to put numbers from 1 to 9 in a manner so that respective row, column and diagonal add up to 15. I have only been able to come up with one solution: 6 1 8 7 5 3 2 9 4  Through some calculations and trial and error method. Is there any strategy or way of approach to this problem, or is trial and error method the solution to it? In a 3x3 grid, I'd have to put numbers from 1 to 9 in a manner so that respective row, column and diagonal add up to 15. I have only been able to come up with one solution: $$\begin{array}{ccc} 6 & 1 & 8 \\ 7 & 5 & 3 \\ 2 & 9 & 4 \end{array}$$ Through some calculations and trial and error method. Is there any strategy or way of approach to this problem, or is trial and error method the solution to it? Question Protected by Community♦ occurred May 24 '15 at 14:45 3 edited tags | link edited Dec 5 '14 at 2:55 xnor 21.7k33 gold badges6464 silver badges124124 bronze badges 2 deleted 274 characters in body edited Jul 27 '14 at 23:31 Doorknob 4,03144 gold badges2626 silver badges4646 bronze badges I am sorry for I do not exactly know the name of this puzzle. My question is: InIn a 3x3 grid, I'd have to put numbers from 1 to 9 in a manner so that respective row,column column and diagonal add up to 15. I have only been able to come up with one solution: 6 1 8 7 5 3 2 9 46 1 8 7 5 3 2 9 4  Through some calculations and trial and error method. I would like to ask: 1.IsIs there any strategy or way of approach to this problem, or is trial and error method is the answersolution to it? I am looking to generate a code based on this, hence I would require to know the answer to my question. Any help would be highly appreciated. Thank you. I am sorry for I do not exactly know the name of this puzzle. My question is: In a 3x3 grid, I'd have to put numbers from 1 to 9 in a manner so that respective row,column and diagonal add up to 15. I have only been able to come up with one solution: 6 1 8 7 5 3 2 9 4 Through some calculations and trial and error method. I would like to ask: 1.Is there any strategy or way of approach to this problem, or trial and error method is the answer to it? I am looking to generate a code based on this, hence I would require to know the answer to my question. Any help would be highly appreciated. Thank you. In a 3x3 grid, I'd have to put numbers from 1 to 9 in a manner so that respective row, column and diagonal add up to 15. I have only been able to come up with one solution: 6 1 8 7 5 3 2 9 4  Through some calculations and trial and error method. Is there any strategy or way of approach to this problem, or is trial and error method the solution to it? 1 asked Jul 25 '14 at 22:19 Freya 8911 gold badge11 silver badge33 bronze badges