2009 UNCO Math Contest II Problems/Problem 1

Revision as of 21:27, 19 October 2014 by Timneh (talk | contribs) (See also)

Problem

How many positive $3$-digit numbers $abc$ are there such that $a+b=c$ For example, $202$ and $178$ have this property but $245$ and $317$ do not.


Solution

See also

2009 UNCO Math Contest II (ProblemsAnswer KeyResources)
Preceded by
First Question
Followed by
Problem 2
1 2 3 4 5 6 7 8 9 10
All UNCO Math Contest Problems and Solutions