In a gathering of 4 persons, the birthdays of three come in one month and that of
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In a gathering of 4 persons, the birthdays of three come in one month and that of the fourth in one of the remaining eleven months. Considering the probability of birth of each person in each month equal to \(1 / 12\), find the probability that
(a) the three persons were born in January and the fourth in October;
(b) the three were born in some one month and the fourth in one of the other eleven months.
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