Challenge

[Steven Alligood]

On Fri, Nov 20, 2009 at 1:06 PM, Sasha Pachev <sasha at 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?
>>>        
>>

THIS is what you teach your son about numbers?  ROFL.  PLEASE tell me 
your son is older than 4!

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