Monday, October 10, 2005

Topology in your Pants

PUZZLE
QUESTION/PUZZLE
Is it possible to take a cord of rope 6 feet long and tie it snugly around your right ankle and your left ankle, take off your pants, turn them inside out, and put your pants back on without ever cutting the rope?

- Try thinking through the problem instead of actually using rope and undressing... (smile)!

(source: Dr. Paul Lin passed this to us after hearing it on NPR)
Click on comments below for answer.

1 comment:

Axygos said...

For this one you need to imagine the pants as one continous tube with the ends of the tube at each of the openings for the legs. Ignore the opening that goes around your waste. Once the pants are off and on the rope, invert the tube (inside-out) by telescoping one leg into itself and then the other. The pants will be inside out when put back on.