A standard 52 card deck is well shuffled and the cards are drawn one at a time and without replacement until a king or queen is drawn. Determine the following probabilities.

a) What is the probability that at least 4 cards are drawn before the first king or queen occurs?

b) Given that a king or queen does not occur in the first 5 cards drawn, what is the probability that a king or queen occurs in 3 or fewer more draws?