how do I buy more than one with conventional loan

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How does this work, if I earn $50k year, and I want to buy 6 homes (each cost $100k) and put 20% down on each, can I buy them all or 4x my income is only $200k therefore I can only by two.  

Or can I tell the bank I will be renting them all out, which will be paying my mortgage, thus I can buy more, please explain this to me as its confusing.  How do people on here buy 20plus properties.