The Sensex at the Bombay Stock Exchange rose for the second consecutive session, gaining 55 points, or 0.3 percent, to 17,559, today, amid optimism that debt-riddled Greece may secure a bailout. The Nifty at the National Stock Exchange gained 24 points, or 0.5 percent, to 5,278.Stock markets in Japan, China, Hong Kong, Singapore, and South Korea rose between 0.1 percent and 1.5 percent.