Probability of different numbers

Question

If there are 15 girls in a class and 20 boys, what is the probabilty that the next 2 students entering the classroom are boys?

Answer 1

This problem is not well written.  How many students are in the room at the instant when this question applies?

 

If the total enrollment is 35, then the next students to enter this room will be (presumably) either those on the roster of the NEXT CLASS, or perhaps will be a Courier with a note from the office (carrying a summons, say). Or it could be a new student.

 

Needs to be specified better!