In roulette there are 24 slots into which a ball may land. They are numbered 0, 00, 000, 0000 and 1 through 20. The odd numbers are red, even numbers are black, and the zeroes are green. A ball is thrown randomly into a slot.
(a) What is the probability that it is red?
(b) What is the probability it is number 7?
(c) What is the probability it is either red, or between 10 and 14, but not both?
(d) What is the probability it is not black?