New York Is A Concrete Jungle Where Dreams Are Made Of. To This Extent, A Young Upstart Tries To Drum Up Business In Three Of

New York is a concrete jungle where dreams are made of. To this extent, a young upstart tries to drum up business in three of the tallest buildings in the city. Below from left to right are pictured One World Trade Center (104 floors), the Empire State Building (82 occupied floors) and the Bank of America Tower (55 floors).

Consider the case where this person enters one of the three buildings randomly and goes to a random floor. 3 (a) [easy] Draw a probability tree of this random event. Use ... notation so you don't need to draw hundreds of lines.