Mumbai, Aug. 4 -- The Nifty and Sensex showed a rare divergence on close of trade on Monday as exchanges adopted a new auction mechanism for stocks with traded futures and option contracts.The Nifty was up 1.6% at 3.30pm on Monday. Sensex closed up 0.7%. SEBI's new Closing Auction Session replaced the earlier method of calculating closing prices for stocks in the F&O segment where closing prices were based on volume-weighted average price of trades in the final 30 minutes of continuous trade. P10...