* A group of private investors including Bain Capital, Merrill Lynch & Co. and Kohlberg Kravis Roberts & Co. has received U.S. antitrust clearance to buy HCA Inc. for $33 billion.
* Entercom Communications Corp. agreed to buy 15 stations in four markets from CBS Corp. for $262 million, entering Austin, Texas, and Cincinnati and expanding its presence in Memphis, Tenn., and Rochester, N.Y.
