On Fri, Nov 20, 2009 at 1:06 PM, Sasha Pachev <sa...@asksasha.com> wrote: > I just came up with this while teaching my son about numbers. Let's > see how quickly somebody figures this out. > > If you had a 64 bit number written down in hex, how could you quickly > tell without the aid of any computational device, including pencil or > paper if it is divisible by 15? > > How about 17?
My own brain is a computational device, isn't it? Did you all just cheat? ;) Easy, I'd ask someone else to do it for me. :-D /* PLUG: http://plug.org, #utah on irc.freenode.net Unsubscribe: http://plug.org/mailman/options/plug Don't fear the penguin. */
