Monday, May 24, 2010

The Pen is Mightier than the Pig

How can you build pig pens so you can put nine pigs in four pens such that each pen has an odd number of pigs?


  1. Could the pens be four concentric circles, with all the pigs in the middle?

  2. Maybe one large pen, separated into 3 smaller pens with 3 pigs each?

    Does that count?

  3. Put three pigs into each of three pens. Then build the fourth pen around the first three pens.

  4. Hmmm...none of these answers work. The outer pen in each case has no pig of its own, it just surrounds the inner pens. My answer is the most dubious of all, with only the one central pen containing any pigs.

    That some puzzles are unsolvable is a solution in itself!


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