15 students join a summer course. Every day, 3 students are on duty after school to clean the classroom. After the course, it was found that every pair of students have been on duty together exactly once. How many days did the course last for?
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Answered by
2
Answer:
45 days
Step-by-step explanation:
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Answered by
1
Answer:
45dayyy
Step-by-step explanation:
because
15*3=45
(students*every day 3 students=total no. of dayy...
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