Can sombody explain How to solve this problem?

Assume that the number of airplane crashes during a year follows a Poisson distribution with parameter lambda = 2 per year. Find the probability that the time between the next two crashes is at least 4 months.

Assume that the number of airplane crashes during a year follows a Poisson distribution with parameter lambda = 2 per year. Find the probability that the time between the next two crashes is at least 4 months.

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