There are n distinct recruiters at a recruiting event. Every second one of the n recruiters uniformly at random comes by to shake your hand, and then walks back. The same recruiter may come to shake your hand multiple times. However, by the kth recruiter (k ∈ Z +), you need to leave the event. At this point (after k seconds), what is the expected number of recruiters you' have not shaken hands with?
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