Question 263210
The A. B. Company buys calculators from a Korean supplier. The probability of a defective calculator is 10%. 
If three calculators are selected at random, what is the probability that at least one of the calculators will be defective? 
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P(at least one) = 1 - P(none are defective)
= 1 - 0.9^3
= 1 - 0.729
= 0.271
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Cheers,
Stan H.