2010 UNCO Math Contest II Problems/Problem 7
Revision as of 21:18, 19 October 2014 by Timneh (talk | contribs) (moved 2010 UNC Math Contest II Problems/Problem 7 to 2010 UNCO Math Contest II Problems/Problem 7: disambiguation of University of Northern Colorado with University of North Carolina)
Problem
and
are each
-digit
numbers (like
and
), and all four digits are different.
The sum
is a
-digit number made up of two more different digits (
is not necessarily prime).
Further, the difference
consists of yet two more different digits (again,
is not
necessarily prime). The number
is a two digit
number which uses the remaining two digits.
What is
?