Question: Need help finding the answer for this Statistics and Probability Question Patrick is required to sell candy bars to raise money for the school field

Need help finding the answer for this Statistics and Probability Question

Patrick is required to sell candy bars to raise money for the school field trip. There are 100 houses in his neighborhood, and Patrick is not supposed to return home until 20 candy bars have been sold. So, he goes door to door, selling candy bars. At each house, there is a 0.4 probability of selling a single candy bar (no more than one will ever be bought in a house). What is the probability that Patrick finishes and returns home on reaching the 40th house?

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