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Source: Manhattan Prep
A certain junior class has 600 students and a certain senior class has 800 students. Among these students, there are N sibling pairs, consisting of a Junior and a Senior. What is the value of N?
1) If a student is selected from each class at random, the probability that the students do not form a sibling pair is 4799/4800
2) If a student is selected from each class at random, the probability that exactly ONE of these students is a member of a sibling pair is 1/4
The OA is A
A certain junior class has 600 students and a certain senior class has 800 students. Among these students, there are N sibling pairs, consisting of a Junior and a Senior. What is the value of N?
1) If a student is selected from each class at random, the probability that the students do not form a sibling pair is 4799/4800
2) If a student is selected from each class at random, the probability that exactly ONE of these students is a member of a sibling pair is 1/4
The OA is A
