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How to do questions 8 and 17 in the college entrance examination of mathematics in Sichuan?
Short answer: The question is, if the probability that at least one system will not fail at any time is 49/50, then the probability of failure at any time is 1/50, right? Then the probability of failure is110 * p =1/50p =1/5 ok. This is the simplest solution to reverse thinking.
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