Suppose that the lemmings in Exercise 24 can sometimes crawl back up the cliff. In particular, suppose

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Suppose that the lemmings in Exercise 24 can sometimes crawl back up the cliff. In particular, suppose that a lemming at the bottom of the cliff climbs back up with probability 0.1 each hour. What is the probability that a particular lemming is on top of the cliff after 3 hours? If 5000 lemmings are standing around on top of the cliff to begin with, about how many will be there after 3 hours? How much difference does crawling back up make?
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