1
$\begingroup$

SITUATION:
20 students in class.
There are 10 benches with each bench able to sit two students.
A test were given and student scored 12 A's and 8 B's
8 A's from same bench and 4 A's from students sitting at different bench.
4 B's from the same bench and 4 B's from students sitting at different bench.

What is the probability of this happening (8 A's and 4 B's from the same bench given 12 A's and 8 B's)?

  • 0
    You might be able to adapt the solution to a very similar question: http://math.stackexchange.com/questions/236802/probability-of-an-event-occurring/236822#2368222012-11-14
  • 7
    Subjective assessments such as "easy", "difficult", "tricky" vary widely -- in my view they contribute very little to summarizing the question for someone scanning the titles. Also, note that the tags are visible wherever the title is visible, so having the only tag as the only substantial word in the title makes it highly redundant. Please consider replacing the title by something more specific, such as "probability of arrangement of pairs of students on benches".2012-11-14

1 Answers 1