A person has forgotten the last digit of a telephone, Mathematics

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A person has forgotten the last digit of a telephone

A person has forgotten the last digit of a telephone number, so he dials the number with the last digit randomly chosen. How many times does he have to dial (not counting repetitions) in order that the probability of dialing the correct number is more than 0.5.

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Mathematics: A person has forgotten the last digit of a telephone

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