sasha at asksasha.com
Fri Nov 20 13:06:57 MST 2009
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?
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