In a class of 7, there are 5 students who forgot their lunch.
If the teacher chooses 2 students, what is the probability that neither of them forgot their lunch?
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Answer:
total number of student=7
number of student forgot their lunch=5
therefore,number of student did not forgot their lunch=7-5=2
therefore,probability that neither of them forgot their lunch=2/7
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Answer:
1/21
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