Mathematics, 26.08.2019 21:30, piggygirl211

An internet search engine looks for a keyword in 9 databases, searching them in a random order. only 5 of these databases contain the given keyword. find the probability that it will be found in at least 2 of the first 4 searched databases.

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An internet search engine looks for a keyword in 9 databases, searching them in a random order. only...