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Assume that a person can be born on a Monday with probability 1/3 and with equal...

Assume that a person can be born on a Monday with probability 1/3 and with equal probability any other day of the week. What is the probability that among 4 randomly selected people, two were born on the same day and the other two in two other days (for instance, two on Tuesday, one on Saturday and one on Friday)

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