The Foreign institutional investors (FIIs) were net sellers of Rs 795.13 crore in the futures & options segment on Tuesday.According to data released by the NSE, FIIs were net sellers of index futures to the tune of Rs 738.58 crore and bought index options worth Rs 302.18 crore. They were net sellers of stock futures to the tune of Rs 361.57 crore and bought stock options worth Rs 2.84 crore.