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Mathematics 7 Online
OpenStudy (kirbykirby):

Consider a sequence of independent trials. At each trial, the possible outcomes are “S” and “F”. On trial n, the probability of getting “S” is equal to Pn = (1/4)^n, n = 1, 2, . . .. Let T be the waiting time until the first occurrence of “S”. What is the distribution of T, what is its probability mass function?

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