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There are three persons aged 50, 60 and ...

There are three persons aged 50, 60 and 70 years. The probability to live 10 years more is 0.8 for a 50 years old 0.5 for a 60 years old and 0.2 for a 70 years old person. Find the probability that at least two of the three persons will remain alive 10 years hence.

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