Two balls are drawn, without replacement, from a bag containing 13 red balls numbered 1-13 and 5 white balls numbered 14-18. What is the probability that
(a) The second ball is even-numbered, given that the first ball is even-numbered?
(b) The first ball is red and the second ball is even-numbered?
(c) The first ball is even-numbered and the second is white?
Use probability trees to find the probabilities of the indicated outcomes.