In a class of 30 students, 9 have a brother and 17 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?

26/30=13/15 is the probability that a student chosen randomly from the class has a brother and a sister.

Step-by-step explanation:

both brother and sister=7

Brother is 9

Sister is 17

probability of brother and sister={9/30}+{17/30}=26/30

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step-by-step explanation:

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step-by-step explanation: