Here is an interesting Probability question:

There are 30 books sent 5 persons, and each person can get 6 books. 10 of the 30 books are secondhand. All possible outcomes are equally likely. So:

A = person #1 receives 3 secondhand books.

B = person #2 receives 6 secondhand books.

C = person #3 receives 5 secondhand books.

D = person #4 receives 1 secondhand books.

E = person #5 receives at least 2 secondhand books.

Q1. P(C|B)=?

Q2. P(D|B)=?, P(A|B)=?, P(D)=?

Q3. P(B|D)=?

Q4. P(E|A)=?

Q5. P(E|B)=?