All about flooble | fun stuff | Get a free chatterbox | Free JavaScript | Avatars    
perplexus dot info

Home > Just Math
Natural Problem (Posted on 2003-08-29) Difficulty: 3 of 5
The Natural Numbers are written successively as shown below:
12345678910111213141516..........., such that the 4th digit is '4' the 9th digit is '9' but the 11th digit is '0', the 15th digit '2', the 17th '3', and so on.
What is the 40,000th digit that appears in this list ?

See The Solution Submitted by Ravi Raja    
Rating: 2.0000 (3 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
re: Solution | Comment 8 of 10 |
(In reply to Solution by dennis wenne)

3 mistakes you made:

1. There are 9 1-digit-numbers which are relevant for this problem cause 0 is left out. Which means that we have 38889 digits in front of the first 5-digit-number.

2. 40,000-38889 = 1111

3. Thus we need the first digit after the 222nd 5-digit-number like the other solutions tell you. Your last mistake was that 10,022 is not the 22nd 5-digit-number. It's the 23rd.
But we need the 223rd which is 10,222 and the first digit is 1.
Edited on September 15, 2003, 7:11 pm
  Posted by abc on 2003-09-15 18:55:27

Please log in:
Login:
Password:
Remember me:
Sign up! | Forgot password


Search:
Search body:
Forums (0)
Newest Problems
Random Problem
FAQ | About This Site
Site Statistics
New Comments (3)
Unsolved Problems
Top Rated Problems
This month's top
Most Commented On

Chatterbox:
Copyright © 2002 - 2024 by Animus Pactum Consulting. All rights reserved. Privacy Information