N. Chandrasekaran (L), Chief Operating Officer of Tata Consultancy Services (TCS) exchanges documents with Sanjar Nayar (R), Chief Executive of Citi Bank, South Asia as TCS Chief Executive S. Ramadorai and TCS Chief Financial officer S. Mahalingam (2nd L) look on during press conference in Mumbai October 8, 2008. India's Tata Consultancy Services said on Wednesday it would acquire Citigroup's back office unit in India for about $505 million in cash, as the U.S. financial giant sheds its non-core assets. REUTERS/Arko Datta (INDIA)