View Answer & Explanation
Working from top to bottom, numbers represent the sequence of Square Numbers, from 144 to 289, with the first digit left out.
In each row, the middle value equals the sum of the left and right hand values, adding 2 for the top row, 4 for the middle row, and 6 for the bottom row.
Starting at the top, add 4 to the first number to get the second, then add 5, 6, 7 etc.
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