ABSTRACT
P(C|A) = p 2− p and P(C|B) = p.
The probabilities are not the same since p
2− p = p implies p = 0 or 1.
9. Let A be the event that the slip numbered 1 was drawn twice and B the event that the sum of the numbers on the three slips drawn is 8. Then P(AB) = 3/63 and P(B) = 21/63 so P(A|B) = 3/21.
