Here's a good guide on how to invest in Elrond IEO on Binance and how the lottery system works:
https://coincodex.com/article/3855/how-to-invest-in-the-elrond-ieo-on-binance/
https://coincodex.com/article/3855/how-to-invest-in-the-elrond-ieo-on-binance/