A herd of lemmings is standing at the top of a cliff. Each jumps off with probability

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A herd of lemmings is standing at the top of a cliff. Each jumps off with probability 0.2 each hour. What is the probability that a particular lemming remains on top of the cliff after 3 hours? If 5000 lemmings are standing around on top of the cliff, about how many will remain after 3 hours?
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