The Sensex at the Bombay stock exchange which opened on a strong note at 172 points continued to trade higher in the late morning deals and was trading 194 points up at 17,782.After gaining over 442 points in the previous two sessions, the 30-share baraometer, rose by 172.30 points at 17,759.97 in the opening tarde today. All sectoral indices, led by metals and realty, were trading in the positive zone with gains of up to 1.46 per cent.In a similar fashion, the broad-based National Stock Exchange Nifty index surged by 62.45 points to trade at 5,422.00