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

Home > Just Math
S(2*N) ≤ 2*S(N) ≤ 10*S(2*N) (Posted on 2010-01-16) Difficulty: 3 of 5
S(N) denotes the sum of the digits of a base ten positive integer N.

Prove that:

S(2*N) ≤ 2*S(N) ≤ 10*S(2*N)

See The Solution Submitted by K Sengupta    
Rating: 5.0000 (1 votes)

Comments: ( You must be logged in to post comments.)
  Subject Author Date
An attempt at a proof...Dej Mar2010-01-17 13:09:21
solution (kind of)Justin2010-01-16 16:41:32
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 (11)
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