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How many of the integers from 1 to 1000 contain the digit 4?

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How many of the integers from 1 up to one billion contain the digit 7?In about one minute, estimate how many prime numbers between 1 and 1000 do not contain the digit 7.Make a market two points wide on the probability that a randomly chosen integer from 1 to 100 does not contain the digit 7.

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