View Answer & Explanation
Starting with the bottom line of the triangle and moving up, the sum of the digits in each line decreases by 5 each time, from 20 to 5.
Numbers in the squares of the top middle figure equal the sum of the numbers in corresponding squares of the other 3 figures.
Starting at the top left and working down, then to the right and up, and finally to the right and down in a zig-zag shape, numbers follow the repeated sequence, subtracting 1 then adding 3 etc.
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