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represents 29 students in a class
B represents students who have a brother
S represents students who have a sister
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B
a) One student from the class is chosen at random.
What is the probability that the student has a sister?
Optional working
7
Answer
b) One of the students who has a brother is chosen at random.
What is the probability that this student has a sister?
4
2x
S
x + 3



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