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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)

Comments: ( Back to comment list | You must be logged in to post comments.)
Solution re: Hey, you, get offa my cloud (Solution) | Comment 14 of 16 |
(In reply to Hey, you, get offa my cloud (Solution) by Penny)

201987512 ::shrugs::
  Posted by nathan on 2004-09-14 14:49:42

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