This problem originally appeared in 1978, as a challenge question. As stated then,^{1}

Four birds land at random positions on a finite length of wire. Upon landing, each bird looks at its nearest neighbor.

a. What is the probability that a bird picked at random is looking at another bird that is looking at it?

b. What is the probability if there are *n* birds, with *n* > 4?

The solution appeared the next year.^{2} (I have converted the birds into cars and the wire into a car lot to, I hope, make the problem more “relevant”.) ...

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