There are five closed boxes on a table. Three of the boxes have
nice prizes inside. The other two do not. You open boxes one at a time until you
find a prize. Let X be the number of boxes you open.
a) Find the probability mass function of X.
I'm stuck on this question. Do I need to find the probability of all possible outcomes? Let E be empty and let F be a prize. Find P(F), P(EF), P(EEF)?
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