Mathematics, 22.12.2020 08:10, KhaliylTestman

In a class of 28 students, 11 have a brother and 9 have a sister. There are 2 students who have a brother and a sister. What is the probability that a student has a sister
given that they have a brother?

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In a class of 28 students, 11 have a brother and 9 have a sister. There are 2 students who have a b...