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[puzzle] Driving Me Insane
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19 Jan 2007, 12:05
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Ste
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Join Date: Apr 2001
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Re: [puzzle] Driving Me Insane
Quote:
Originally Posted by
hyfe
yes, If the two digits are X and Y then:
(X*10 + Y) - (X+Y) = X*9
yeh simple really - you'll notice that all multiples of 9 then have the same symbol...
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