Mumbai, Jan. 13 -- Tech Mahindra Ltd gained for a third straight session today. The stock is quoting at Rs 1604.8, up 1.18% on the day as on 12:49 IST on the NSE. The benchmark NIFTY is down around 0.41% on the day, quoting at 25685. The Sensex is at 83470.88, down 0.49%. Tech Mahindra Ltd has gained around 1.87% in last one month. Meanwhile, Nifty IT index of which Tech Mahindra Ltd is a constituent, has gained around 0.92% in last one month and is currently quoting at 37988.25, up 0.12% on the day. The volume in the stock stood at 11.1 lakh shares today, compared to the daily average of 10.63 lakh shares in last one month. The benchmark January futures contract for the stock is quoting at Rs 1604.1, up 0.85% on the day. Tech Mahindra Lt...