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**astefecyAvevy** · 07-13-2006, 01:29 PM

So easy.

Let the digits be x and y. The number is 10x+y.

Subtract the sum. 10x+y-(x+y) = 9x. So you'll always get a multiple of 9. Each multiple of 9 has the same symbol.

07-13-2006, 01:29 PM	#2
astefecyAvevy Join Date Oct 2005 Posts 531 Senior Member	So easy. Let the digits be x and y. The number is 10x+y. Subtract the sum. 10x+y-(x+y) = 9x. So you'll always get a multiple of 9. Each multiple of 9 has the same symbol.
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