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  3. assume that the world population is 10 billion people and...

Question: assume that the world population is 10 billion people and...

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Assume that the world population is 10 billion people and each one is assigned a serial number between 0000000000 and 9999999999. If you pick a random person and look at the number, what is the probability that 5 digits are equal to "5" or more?

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