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7x9=63 (usually), but did you know it can sometimes be equal to 64, 65 or 66?

Question asked by Jean-Christophe Lelasseux Employee on Jun 28, 2013
Latest reply on Jun 28, 2013 by Nicholas Howe

Well, according to this gentleman it seems to be the case... with an original and somehow elegant way of demonstrating it.



If you like brain teasers you can surely enjoy figuring this one out.

Have a go and we will compare findings.