Home > Just Math
| S(2*N) ≤ 2*S(N) ≤ 10*S(2*N) (Posted on 2010-01-16) |
 |
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)
|
|
Submitted by K Sengupta
|
|
Rating: 5.0000 (1 votes)
|
|
|
Solution:
|
(Hide)
|
|
Refer to the solution submitted by Dej Mar in this location. |
Comments: (
You must be logged in to post comments.)
|
|
Please log in:
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:
|
