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Square sequence (Posted on 2003-09-09) Difficulty: 3 of 5
Here is a square sequence of numbers.

392?
6  3
7  4
?817
What are the two question marks?

See The Solution Submitted by Gamer    
Rating: 4.5000 (4 votes)

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re(2): Solution | Comment 16 of 18 |
(In reply to re: Solution by Gamer)

Noticing the same thing, that the numbers apart from each other add to 10, I started to delve into why. Let me know what you think...

The primary reason for this is the fact that the last digit of each sum is the only one entered. It's not that they add to 10 but that every other number added together is divisible by 5. If you add all the numbers in the puzzle together and divide by amount of numbers there are (60/12), then you get 5. I decided to see if the same would hold true no matter how big the square is and it works (even if the sequence doesn't loop again and again as in this one).
  Posted by greg on 2003-09-13 00:16:07

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