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Mathematics, 12.06.2020 02:57 estherdinhllama

What is the probability that when interviewing a group of pensioners, it will be necessary to interview exactly 5 of them to find the first pensioner who has not purchased any house on the outskirts of a city? On average, how many people should be interviewed to obtain the first pensioner who has not purchased a house on the outskirts of a city?

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