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Energy major Reliance Industries led the gains, rising 0.8 percent after an oil ministry source said India's cabinet may consider approval for a $7.2 billion deal between the company and BP next week.
At 9:15 a.m. (0345 GMT), the 30-share BSE index was up 0.33 percent at 18,788.15 points, with 22 components advancing.
The 50-share NSE index was up 0.25 percent at 5,639.35 points.
Copyright Reuters, 2011