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How many 1s? (Posted on 2004-07-26) Difficulty: 2 of 5
If I took all the numbers from one to one billion:
  1. How many of them contain at least one '1'?
  2. If I wrote them out in one long line, how many 1 digits would there be?

See The Solution Submitted by Thalamus    
Rating: 3.0000 (12 votes)

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Some Thoughts Problem Solution Comment 16 of 16 |

1. The total number of posiive integers from 1 to 1 billion containing at least one "1" is 612,579,512.

2, Total number of 1's in all the integers from 1 to i billion is 900,000,001.

 


  Posted by K Sengupta on 2007-05-04 13:20:00
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