Consider a modified version of the experiment where we flip a coin until the first occurrence of tails or until we flip the coin four times, whichever comes first.
(a) List the possible outcomes of this experiment. How many are there? Would you expect each outcome to be equally probable?
(b) Can you develop a method to use the classical approach to assign probabilities to this experiment? You are going to have to define an atomic outcome which is more fundamental than the outcomes listed in part (a).
(c) Given the probability assignment you developed in part (b), find the probabilities of each outcome listed in part (a).