Three cards are selected at random one after the other and without replacement from a regular deck of cards. (A regular deck consists of 52 cards. There are four suits: spades, hearts, diamonds and clubs. Each suit has 13 numbers: 2-10, jack, queen, king and ace.) a. What is the probability that all three cards are "Hearts"? b. What is the probability that the first card is the "King of Hearts" and the second card is a "Queen"? c. What is the probability that at least one of the cards is an "Ace"?