Mathematics, 05.11.2019 04:31 tiffxnnyyy

An employee suspected of having used an illegal drug is given two tests that operate independently of each other. test a has probability 0.9 of being positive if the illegal drug has been used. test b has probability 0.8 of being positive if the illegal drug has been used. what is the probability that neither test is positive if the illegal drug has been used?

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