Wouldn't that be problimatic? People could just create own answeres by putting the best explanations together. In this quiz most people (including me) where just copying the 4th answer from other people. We couldn't know if it was right or wrong because there was no explanation. I think with an explanation there would be even more copying from the comments and less people who try to find the answer themselves.
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I was thinking for just spot the difference questions that might have multiple answers. Very few of my questions have more than one possible answer. I noticed everyone copied the wrong answer for Question 4. Copying is a bad strategy because if it is correct then the person you copied from has most likely already won the contest unless they made a mistake on a question you know the answer too then I see some merit. If they got it wrong so have you and you still don't win.
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.
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.