A drunkard walks out of a bar at midnight. He is in 3-dimensional space of an infinite size. The probability of his stepping 1 step **forward**, **backward**, **left**, **right**, **up** or **down** is equal. Calculate the probability (to two decimal places) of his (eventually) returning to the bar.

**Details and Assumptions:**

Assume the bar is a point particle at the origin.

We require the probability that he will, at any point in time, return to the bar.

Do not try this at home.

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