Mathematics, 28.03.2021 02:50 microwave13016

In a class of 28 students, 21 have a brother and 9 have a sister. There are 7 students who have a brother and a sister. What is the probability that a student chosen
randomly from the class has a brother and a sister?

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In a class of 28 students, 21 have a brother and 9 have a sister. There are 7 students who have a brother and a sister. What is the probability that a student chosen randomly from the class has a brother and a sister?

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Another question on Mathematics

In a class of 28 students, 21 have a brother and 9 have a sister. There are 7 students who have a brother and a sister. What is the probability that a student chosen
randomly from the class has a brother and a sister?