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How to prove that: http://im24.gulfup.com/2012-05-06/1336294097491.jpg

Quote: Originally Posted by Mhmh96 How to prove that: http://im24.gulfup.com/2012-05-06/1336294097491.jpg Note that is a multiple of nine. Also, if then which is a multiple of nine. If then is a multiple of nine. WHY?