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

Home > Just Math
50 - Digit Number (Posted on 2003-11-15) Difficulty: 3 of 5
A number of 50 digits has all its digits equal to 1 except the 26th digit. If the number is divisible by 13, then find the digit in the 26th place.

See The Solution Submitted by Ravi Raja    
Rating: 3.3333 (6 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
re: A similar problem but perhaps a bit trickier | Comment 13 of 39 |
(In reply to A similar problem but perhaps a bit trickier by Kirk)

One way is to find that 564387902841 leaves a remainder of 4 when divided by 11, while 10000 leaves a remainder of 1. So we need to add (11-4) = 7 times 10000, by placing a 7 in that x position (the 10,000's position) in which we had tentatively placed a zero.
  Posted by Charlie on 2003-11-20 14:59:49

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

Search body:
Forums (0)
Newest Problems
Random Problem
FAQ | About This Site
Site Statistics
New Comments (2)
Unsolved Problems
Top Rated Problems
This month's top
Most Commented On

Copyright © 2002 - 2018 by Animus Pactum Consulting. All rights reserved. Privacy Information