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19 August, 08:27

Of 30 students in a class 17 have a brother, 20 have a sister, and 11 have a brother and a sister. What is the probability that a randomly selected student has a brother given they have a sister?

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  1. 19 August, 09:39
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    11/30

    Step-by-step explanation:

    Since there are 30 students in total, and 11 of them have both a brother and a sister, then 11/30 (11 out of the 30 students) would be the probability of a student having a brother given that they have a sister.
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