9 ? 7 12
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Posted 08 January 2014 - 05:11 PM
Spoiler for it could also be...14. If you add each number to its mirror number (mirrored through the midpoint), you get 21.
That could be right..the 7 numbers you see are vertices of a die with total numbers of pips on its 3 faces, the hidden vertex has 3,5,& 6 pips.Good hit!
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