# Fill in the numbers from 1 to 6 without repetition, so that each side of the triangle adds up to 12.

Place the largest numbers, i.e., 4, 5 and 6, at the three corners of the triangle.
Now, 4 + 5 = 9, 4 + 6 = 10 and 5 + 6 = 11
Therefore, by placing 3 between 4 and 5, 2 between 4 and 6, and 1 between 5 and 6 we get the desired magic triangle.

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