Pigs in Pen

A farmer has six pigs and five pens. He desires to place the pigs in

the pens so that there will be an odd number of pigs in each pen. How

can he accomplish this?

The Trick--He places a pen within a pen. Then he places a pig in each

of the other pens, and two pigs in the one which encloses the pen, and

another pig in the enclosed pen.

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