Shown here are the top 10 U.S. cities ranked by number of hotel rooms sold in a recent year.

Suppose four of these cities are selected randomly.
a. What is the probability that exactly two cities are in California?
b. What is the probability that none of the cities is east of the Mississippi River?
c. What is the probability that exactly three of the cities are ones with more than 24 million roomssold?

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Rank City Number of Rooms Sold Las Vegas (NV) Orlando (FL) Los Angeles (CA) Chicago (IL) New York City (NY) Washington (DC) Atlanta (GA) Dallas (TX) Houston (TX) San Diego (CA) 40,000,000 27,200,000 25,500,000 24,800,000 23,900,000 22,800,000 21,500,000 15,900,000 14,500,000 14,200,000 4 10