A standard deck of 52 cards has four queens. Two cards are randomly drawn in succession, without replacement, from a standard deck. What is the probability that the first card is a queen? What is the probability that the second card is a queen? If three cards are drawn, what is the probability that the third is a queen? Make a general conjecture. Prove it if you can. (Hint: Does the probability change if "queen" is replaced by "king" or "seven"?)