Which one of the following numbers is the nearest to the probability that randomly selected three persons are born on three different days of the week ?

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1 Answer

Call the three persons A, B, C.

The probability of B being born on a different day to A is 6/7. The probability of C being on a different day to A or B is 5/7. The combined probability is 6/7×5/7=30/49.

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