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प्रश्न
Choose the correct alternative:
A computer salesperson knows from his past experience that he sells computers to one in every twenty customers who enter the showroom. What is the probability that he will sell a computer to exactly two of the next three customers?
पर्याय
`57/20^3`
`57/20^2`
`19^3/20^3`
`57/20`
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उत्तर
`57/20^3`
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