Hello Dave,
Friday, March 28, 2003, 3:49:44 PM, you wrote:
Dave> Who can explain how this one works?
Dave> http://www.cyberglass.co.uk/FlashEx/mindreader.html
As an example look at the following numbers:
10: 1 + 0 = 1, 10 - 1 = 9
11: 1 + 1 = 2, 11 - 2 = 9
....
19: 1 + 9 = 10, 19 - 10 = 9
21: 2 + 1 = 3, 21 - 3 = 18
22: 2 + 2 = 4, 22 - 4 = 18
23: 2 + 3 = 5, 23 - 5 = 18
30: 3 + 0 = 3, 30 - 3 = 27
39: 3 + 9 = 12, 39 - 12 = 27
90: 9 + 0 = 9, 90 - 9 = 81
95: 9 + 5 = 14, 95 - 14 = 81
So, when you add together both digits of a two digit number, then
subtract the result from the original number you will always get the
set { 9, 18, 27, 36, 45, 54, 63, 72, 81 }
If you check those number on the page you will see that the symbol for
those numbers are all the same. To make it a bit trickier they change
the symbol each time they reload the page.
Now, can one of the list eggheads give a formal proof?
--
Best regards,
Bill mailto:w.gilroy@verizon.net
"The liver is evil, it must be punished"
77 Midget
01 Irish Terrier
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