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The symbols that you look up change every time...so use the same 2 digit number over and over, (like 20 -2 = 18) and the corresponding symbol will change each time. They have assigned that same symbol to all of the possible answers for each try. Not magic, just slight of eye! **************************** Barb Engvall =^..^= Teacher-Librarian John Campbell Elem Selah, WA macbarb@charter.net http://www.selah.k12.wa.us/JC/jc.cfm On Apr 22, 2006, at 9:30 AM, DAVID DENNING wrote: > O wise ones: > > My friend just sent me a math-related "mind-reading" site, and I > have figured out how it works, but I can't prove it. If you want to > look at it first, here's the link. > > http://louhi.kempele.fi/~skyostil/archive/dump/flash/psychic.swf > > > The directions say to choose any two-digit number, add the digits > together, and subtract them from the original number. Then you > look at the list of numbers and find the matching symbol for the > result. You do this without entering anything into the computer. > Then you fix the symbol in your mind and click on the circle, which > then reveals your symbol. > > I tried this with several numbers and always came up with the > same symbol. I noticed that the final numbers were always > multiples of nine. So here is my question. I think that any time > you add the digits of a two-digit number together and subtract from > the original number, you will get a multiple of nine. Is that > true? How do you prove it without going through this process for > every two-digit number? I'm pretty sure there's an n+1 involved > here somewhere! > > Thank you very much! > > Cindy Denning > once and future librarian > Collinsville, TX > cynden744@verizon.net > > -------------------------------------------------------------------- > Please note: All LM_NET postings are protected by copyright law. > You can prevent most e-mail filters from deleting LM_NET postings > by adding LM_NET@LISTSERV.SYR.EDU to your e-mail address book. > To change your LM_NET status, e-mail to: listserv@listserv.syr.edu > In the message write EITHER: 1) SIGNOFF LM_NET 2) SET LM_NET NOMAIL > 3) SET LM_NET MAIL 4) SET LM_NET DIGEST * Allow for confirmation. > * LM_NET Help & Information: http://www.eduref.org/lm_net/ > * LM_NET Archive: http://www.eduref.org/lm_net/archive/ > * EL-Announce with LM_NET Select: http://elann.biglist.com/sub/ > * LM_NET Supporters: http://www.eduref.org/lm_net/ven.html > -------------------------------------------------------------------- -------------------------------------------------------------------- Please note: All LM_NET postings are protected by copyright law. You can prevent most e-mail filters from deleting LM_NET postings by adding LM_NET@LISTSERV.SYR.EDU to your e-mail address book. To change your LM_NET status, e-mail to: listserv@listserv.syr.edu In the message write EITHER: 1) SIGNOFF LM_NET 2) SET LM_NET NOMAIL 3) SET LM_NET MAIL 4) SET LM_NET DIGEST * Allow for confirmation. * LM_NET Help & Information: http://www.eduref.org/lm_net/ * LM_NET Archive: http://www.eduref.org/lm_net/archive/ * EL-Announce with LM_NET Select: http://elann.biglist.com/sub/ * LM_NET Supporters: http://www.eduref.org/lm_net/ven.html --------------------------------------------------------------------