Probability problem?

A store asks to it's providers for an article every thing they run out of those articles after selling the last unit. The sales are individual. There are 4 articles of the brand B, which's sale probability is 0.45 and 5 of the brand A, which's sale probability is 0.55. What are the chances they need to... show more A store asks to it's providers for an article every thing they run out of those articles after selling the last unit. The sales are individual. There are 4 articles of the brand B, which's sale probability is 0.45 and 5 of the brand A, which's sale probability is 0.55. What are the chances they need to ask for new articles of the brand B after the 4th sale?
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