Rising for the third straight session, the Sensex at the Bombay Stock Exchange gained 119 points, or 0.7 percent, to 17,597, today. The Sensex had added 420 points in the previous two sessions. The Nifty at the National Stock Exchange climbed 41 points, or 0.8 percent, to 5,359.Stock markets in Japan, Hong Kong, Singapore and South Korea ended mixed.