This was pretty clearly stated. If a star exactly the diameter of our Sun has a planet the size of Earth orbiting at 1 AU, the chance that its orbital inclination would allow us to see a transit is 1 in 212. IF the diameter of the star was one tenth the diameter (Jupiter or Red Dwarf sized) the change goes down by a factor of ten (1 in 2120). If the planet were orbiting a bloated red giant with a radius of almost 1 AU, the chance would be almost 1 in 1, but the event would probably reduce light so little that it would be unobservable.
Originally Posted by Sporally
Forming opinions as we speak