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# Windows 7: Same result

 24 Sep 2010 #1 mindinka windows 7 Pro x64 171 posts Same result Hi guys there is something interesting found on Internet anyone could explain that..? Pick a number from 1-9. Multiply by 3. Add 3. Multiply by 3 again. Now add the two digits together and the result is always 9, isn't it? My System Specs
 24 Sep 2010 #2 Dwarf Windows 8.1 Pro RTM x64 10,375 posts Doncaster, UK OK. Let A represent the initial number and B & C the intermediates. We have A x 3 = B, B + 3 = C and C x 3 = A [9-A] The final result is always a 2 digit number with the first digit being the original number and the second being 9 minus that number. Here's some more interesting reading: Casting out nines - Wikipedia, the free encyclopedia My System Specs
 24 Sep 2010 #3 Everlong Windows 8.1 Pro x64 3,378 posts Morecambe, Lancashire, England I remember doing this when I was in, I think my second year, of primary school. We had this as a maths problem, and the teacher chose a few numbers between 1 and 9 for us to work out and obviously the answer was always going to be 9, but I didn't understand it when I was only 6 years old. I thought I was doing it wrong because it didn't make sense to be getting the same answer for 3 questions in a row, lol. My System Specs
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 24 Sep 2010 #4 mindinka windows 7 Pro x64 171 posts I missed that lesson... I guess... My System Specs