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October 7th, 2015, 05:02 PM   #1
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Lightbulb Hard problem 2

9-1-5
4-8-3
2-?-7

what will be for ? SHOW YOUR WORK
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October 7th, 2015, 06:27 PM   #2
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It's a "magic square", quite apart from the really obvious reason why the obvious answer is correct.
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