Binary Star Systems and More?

OK we know binary star systems are most popular,as are systems of three
or more stars. They all must find a mutual center of gravity to orbit
around. That could even be a neutron star,or an invisible blackhole.
What is the most stars found in a star system? What type of star
usually makes up its center? Seems this type of star system must have
came when a nebular was young(more dense). Was it just by luck?
If by luck the uncertainty principle can be used. We could think that
planets in this system would not be very advantageous for having life.
However I know a person in this type of multi-star system is typing out
the same message about a single star system,and he is not a monkey.
Bert