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Saw this on the web somewhere...gave it a couple looks before an answer appeared. But it took a few more looks to determine that one answer wasn't exactly the limit to what we can juice out of this thing.

Rules:

  • Don't post the same answer as the person before you

    (So I guess that means for the first time ever, looking at somebody else's answer is more than encouraged :p )

  • The most impressive/most voted answer will be checkmarked

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    $\begingroup$ If you don't know the answer to your question, then you should state it in your post. Questions should be in general uniquely answerable, otherwise they tend to be too broad. $\endgroup$ – Matsmath Oct 16 '16 at 22:13
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    $\begingroup$ Considering that this question's sole purpose is to gather many answers, it is too broad. Puzzle questions should ideally have one answer. $\endgroup$ – Deusovi Oct 16 '16 at 23:37
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The answer should be

4

because

The numbers represent multiplication:

9 2 1 8 —> 9 * 2 = 18
6 4 2 4 —> 6 * 4 = 24
5 7 3 5 —> 5 * 7 = 35
8 8 6 ? —> 8 * 8 = 64


Testing more patterns

At first sight, you could also find that

9 2 1 8 —> 9 + 1 OR 8 + 2 = 10
6 4 2 4 —> 6 + 2 OR 4 + 4 = 8
5 7 3 5 —> 5 + 5 OR 7 + 3 = 10

but this is broken by the last line

8 8 6 ? —> 8 + 8 OR 8 + 6 don't give 10 or 8

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  • $\begingroup$ I was thinking a bit similar to you. But instead of adding. I subtracted 9 and 2, 1 and 8 which would be 7. 6 and 4, 4 and 2= 2. 5 and 7, 5 and 3= 2. 8 and 8, 6 and 6 = 0 $\endgroup$ – bill bsl Oct 16 '16 at 22:39
  • $\begingroup$ I was also thinking that if you started on the second horizontal row, subtracted 4 and 2, and added 6 and 4. 10 - 2 equals 8, which is present on the last box of the first horizontal row. Third row and fourth row is different. It's 7 subtracted to 3, and 5 subtracted to 5. 4 - 0 is 4. 4 is present on the last box of the second row. Fourth row is 8 subtracted to 6 is 2, 8 subtracted to 1 is 7. 7 subtracted to 2 is 5. 5 is present on the last box of the 3rd row $\endgroup$ – bill bsl Oct 16 '16 at 23:02

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