[Pen questions] calculate the number of occurrences of 1 in the natural number 0-

Source: Internet
Author: User
Description

Calculate the number of occurrences of 1 in the natural number 0-000000.

The train of thought should consider six characters: 000000-999999, with a total of six characters * 1000 000 characters = characters. 0-9 is a probability of occurrence, so the number of 0-9 is 6 000 000/10 = 600. Because the leading 0 does not affect the number of numbers 1-9, in the natural numbers 0-999 999, the number of occurrences of 1-9 is. With the 1 in 1000000, the final answer is 600 001. The greatest truths are simple ......

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