Conside the integers from 1 to 10,000,000.Calculate the numb
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Conside the integers from 1 to 10,000,000.Calculate the number of integers that have the digit 1 in their representation.
Answer_____
Answer_____
在所有1-10,000,000的整数中,有几个数位中包含“1”的
将不足7位的数视作前面有0.
故此,从0,000,001到9,999,999中,所有“没有1”的数共有9^7=4782969个
那么有一的就有9,999,999-4,782,969+1=5,217,031个
将不足7位的数视作前面有0.
故此,从0,000,001到9,999,999中,所有“没有1”的数共有9^7=4782969个
那么有一的就有9,999,999-4,782,969+1=5,217,031个
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