Student testing options
There are 20 students in the class, four of them are being tested by the teacher. How many options are there to choose who the teacher will test?
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Math student
What does this question mean? Don't all the students take all the exams?
It would make more sense if the question said: There are 20 students in the class, and every day four of them go to the library. After how many days will all possible sets of 4 students have gone to the library together, assuming the same 4 never go together twice?
It would make more sense if the question said: There are 20 students in the class, and every day four of them go to the library. After how many days will all possible sets of 4 students have gone to the library together, assuming the same 4 never go together twice?
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