An a small raffle, there are only 2 prizes, and 30 tickets are sold. A boy has 3 tickets in the raffle. Find the probability that he wins (a) first prize, (b) both prize, (c) only the 2nd prize, and (d) a prize.

[spoiler](a) 1/10 (b) 1/145 (c) 27/290 (d) 28/145. [/spoiler]