What makes you think everyone was copying question 4? The answer that most people were giving should be perfectly valid, and is the answer that I came to independently: the sum of each row is 5 more than the sum of the preceding row.
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The vast majority of people arrived at the same answer. It seems highly likely that they were coping. For your solution to work requires a negative number which is a little inconsistent with the other numbers. Saying that, there is certainly some logic to those numbers.