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The number of robberies on the branches of ABC bank in a month are distributed according to a Poisson distribution with parameter . Assume that

The number of robberies on the branches of ABC bank in a month are distributed according to a Poisson distribution with parameter . Assume that the probability of at most one robbery occurring in a month is equal to 12 times the probability of exactly two robberies occurring, find the probability of at least one robbery occurring in a month.

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