FlasherMXer Posted March 7, 2003 Share Posted March 7, 2003 [url]http://www.cyberglass.co.uk/assets/Flash/psychic.swf[/url] You're probably aware of the trick to find whether a number is divisible by 9 - if it's divisible by 9, so is the sum of its digits. The same thing works for divisibility by 3. For example: 12345's digits add up to 1+2+3+4+5 = 15 which is divisible by 3, so 12345 is divisible by 3 (it's 4115×3). 10746's digits add up to 1+7+4+6 = 18 which is divisible by both 3 and 9, so 10746 is divisible by both 3 and 9 (it's 3582×>3 or 1194×9). It's possible to prove that this will always work - one possible proof is: Let m be an n-digit number, and its digits in reverse order be d0, d1 -Okayzaki Link to comment Share on other sites More sharing options...
Corey Posted March 8, 2003 Share Posted March 8, 2003 Uh... Yeah. I like your banner. Link to comment Share on other sites More sharing options...
eleanor Posted March 8, 2003 Share Posted March 8, 2003 Just when I get out of school.... Uh.. ::tries to comprehend and passes out:: Right...what's the point of this again? ^__^ j/k Link to comment Share on other sites More sharing options...
Guest cloricus Posted March 8, 2003 Share Posted March 8, 2003 Hmm yes... Mad banner! Link to comment Share on other sites More sharing options...
DeathKnight Posted March 8, 2003 Share Posted March 8, 2003 [color=crimson]It started with the number 9 and went straight downhill from there.[/color] Link to comment Share on other sites More sharing options...
Mitch Posted March 8, 2003 Share Posted March 8, 2003 [color=red] Uh...I already knew all of that. And I know next to nothing about Math. O-o So this thread is rather pointless. So I'm saying please don't make a pointless thread like this again. This is just a warning. This thread will self destruct in one second. Please stand back. [i]Do not[/i] post a pointless thread like this again. If you've got a brain in the head that isn't already been smoked away, then please consider the validity of something before pointlessly posting it. Good day. :)[/color] Link to comment Share on other sites More sharing options...
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