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by caf
2431 days ago
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Adding the probabilities is a good enough approximation when the probabilities and number of trials are very low, though - as in this case. The true value for at least one failure in 5 trials with an individual 1/50000 probability of failure is 1/10000.4 rather than 1/10000, but it seems clear that the original 1/50000 isn't that precise anyway. |
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