Suppose each box of a popular brand of cereal contains a pen as a prize The pens come in four colors blue red green and yellow

Question

Suppose each box of a popular brand of cereal contains a pen as a prize The pens come in four colors blue red green and yellow Each color of pen is equally likely to appear in any box of cereal What is the probability of having to buy at least five boxes of cereal to get a blue pen Show all of the work that leads to your solution

Kunduz · Accepted Answer

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