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प्रश्न
1 forgot the last digit of a 7-digit telephone number. If 1 randomly dial the final 3 digits after correctly dialing the first four, then what is the chance of dialing the correct number?
विकल्प
`1/999`
`1/1001`
`1/1000`
`4/1000`
MCQ
उत्तर
`1/1000`
Explanation:
It is given that the last three digits are randomly dialed.
Then each of the digits can be selected out of 10 digits in 10 ways.
Hence, required probability = `(1/10)^3=1/1000`
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Probability (Entrance Exam)
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