The Lost Sheep Challenge
charlescurley at charlescurley.com
Fri Sep 28 16:36:05 MDT 2007
On Fri, Sep 28, 2007 at 04:16:11PM -0600, Andy Bradford wrote:
> Thus said "Sasha Pachev" on Fri, 28 Sep 2007 16:07:52 MDT:
> > You have 100 sheep in a flock and they are all numbered. Each has an
> > identification tag with a number - 1 through 100. One of them is lost.
> > Other sheep are scattered over the pasture and cannot be examined in
> > sequential order of their numbers. Come up with a method that would
> > allow you to quickly identify the lost sheep. The use of a simple
> > arithmetical calculator is allowed.
> Hopefully its an HP with RPN, but that might violate your roll call
> rule. :-)
> Just add up the numbers 1--100 for a total of 5050.
Rather than add them all up, understand that from one to 100 there are
50 pairs of number, each of which adds up to 101. So 50*101... making
it easy enough to do on an algebraic calculator.
Charles Curley /"\ ASCII Ribbon Campaign
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