Mathematics, 12.05.2021 05:20 colrow1968

An illuminated billboard changes the advertisement it displays every 30 seconds. The advertisement it displays at any time is randomly selected by a computer from a pool of available advertisements paid for by companies wishing to advertise. After an advertisement is displayed, it is immediately put back into the pool. If 10 companies have each submitted one advertisement, what is the probability that a certain company’s advertisement will be displayed exactly once during any one-minute span?

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