On 10th Feb. 2016, Nifty broke its important support near 7240-7210 levels and saw aggressively selling, afterwards selling took pause near next important support level i.e. 6870 and rebound was seen therefrom. According to rule of polarity, support broken often becomes resistance hence 7200-7240 broken support are now acting as resistance and we can see nifty facing selling pressure every time prices reaches there.