# Calculating the probability that a cord makes a knot

I use earphones to listen to music. The cord connected to the earphones often gets entangled in my pocket and makes a knot, which I always find hard to untangle.

How can I define and calculate the probability that my cord spontaneously makes a knot?

Thank you.

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– Rasmus Nov 7 '11 at 12:45
Thanks so much, that's what I'm looking for. If you post your comment as an answer I'll accept it. – pharmine Nov 8 '11 at 11:31