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Guest Message by DevFuse

# Mathemagician

Member Since 31 Jan 2013
Offline Last Active Jan 31 2013 06:29 AM

### Expected value?

31 January 2013 - 06:29 AM

A long time ago, I posted a problem about an ant in a circle with a diameter of 3 meters. The ant would go 1 meter in a random direction, rest, and go 1 meter in another random direction and repeat this process until it got out of the circle. What is the expected number of 1-meter steps the ant takes before escaping. It was never fully solved and I just recently got back to it and thought of this question: assume f(x) is the expected distance from the center after x steps. Is the answer to the original question merely when does f(x) become greater than 3?