Question: An urn contains three red balls numbered 1, 2, 3, four white balls numbered 4, 5, 6, 7, and three black balls numbered 8, 9, 10. A ball is drawn from the urn. What is the probability that the ball is
(a) white?
(b) white and odd?
(c) white or even?
(d) black or white?
(e) black and white?