A herd of lemmings is standing at the top of a cliff, and each jumps off with

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A herd of lemmings is standing at the top of a cliff, and each jumps off with probability 0.2 each hour. What is the probability that a lemming first jumps on the fifth hour? What is the probability that a particular lemming has not jumped by the end of third hour?
Find the probabilities of the above events.
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