I am trying to solve this quiz, but it is too hard for me.

What number should I put in place of the question mark?

3   6   2   8
2   1   1   3
1   3   1   4
5   5   3   ?
  • 2
    $\begingroup$ Welcome to Puzzling! Where did the quiz come from? - if you didn't create it yourself, could you provide attribution/ a link? $\endgroup$ – puzzledPig Apr 1 '18 at 16:59
  • $\begingroup$ You edited this after accepting an answer, to change the puzzle to something different that invalidates the answer? Why? If you have a new question to ask, ask it as a new question. See the first paragraph of this answer for why changing answered questions is not good. I've rolled back your change. $\endgroup$ – Rubio Apr 2 '18 at 15:29
  • $\begingroup$ Also and has already been mentioned, it looks like you're asking us to solve a puzzle you found elsewhere. For content that you did not create yourself, please provide attribution - at minimum you need to let us know where this came from, and any additional context you can provide is usually a big help to solvers. Posts which use someone else's content without disclosing where it came from are generally deleted. $\endgroup$ – Rubio Apr 2 '18 at 15:29

It could be



The numbers added to get the last column follow the pattern:

X X .
. X X
X X .
. X X

  • $\begingroup$ Austin, thank you! I consider that you are wright. I also think about 10. $\endgroup$ – Alex Petrov Apr 1 '18 at 17:30

I think the answer is


with the idea that

the final number in a row is the sum of the highest and lowest values in the rest of the columns in that row:
6+2 = 8
2+1 = 3
3+1 = 4
5+3 = 8

  • $\begingroup$ Glorfindel, thank you for your answer! But Austin`s version is closer to the truth. $\endgroup$ – Alex Petrov Apr 1 '18 at 17:33

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