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**To**:**LM_NET@LISTSERV.SYR.EDU****Subject**:**[LM_NET] OT: Any math people out there? It's not psychic, it's math!****From**:**DAVID DENNING <cynden744@VERIZON.NET>**- Date: Sat, 22 Apr 2006 09:30:26 -0700
- Reply-To: DAVID DENNING <cynden744@VERIZON.NET>
- Sender: School Library Media & Network Communications <LM_NET@LISTSERV.SYR.EDU>

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 --------------------------------------------------------------------

**Follow-Ups**:**Re: [LM_NET] OT: Any math people out there? It's not psychic, it's math!***From:*Barb Engvall <macbarb@CHARTER.NET>

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