View Answer & Explanation
In each triangle, add together the lower two digits and subtract 2 for the left hand triangle, 3 for the middle and 4 for the right hand triangle, putting the result at the apex of the triangle.
Add together the four outer numbers in each diagram. Divide this answer by two to get the middle number.
In each triangle, the central value equals the average of the 3 values around the outside.
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