Hello! I'm new to this site, so I hope this is the right category to post my question. So here's the deal: in class we get almost only theory, very little practice and formulas. Still, we have homework that contains problems requiring at least some level of mathematics. I usually manage to solve them, but this one troubled me:
At an exam, the students pick on a random principle leaflets with questions. The number of questions is N, and the number of questions the student has studied for is M (M<N). Ак is the probability of the student picking a leaflet, containing a question he is prepared for, provided k questions were already picked by other students. Prove, that the probability Ak is P(Ak)=M/N. Does the reulst confirm, that the chances of the student picking a question he is prepared for do not depend on the time of the picking?
I will be very grateful if you could help me :o
At an exam, the students pick on a random principle leaflets with questions. The number of questions is N, and the number of questions the student has studied for is M (M<N). Ак is the probability of the student picking a leaflet, containing a question he is prepared for, provided k questions were already picked by other students. Prove, that the probability Ak is P(Ak)=M/N. Does the reulst confirm, that the chances of the student picking a question he is prepared for do not depend on the time of the picking?
I will be very grateful if you could help me :o