MathDB

On each OMA lottery ticket there is a

9

-digit number that only uses the digits

1, 2

and

3

(not necessarily all three). Each ticket has one of the three colors red, blue or green. It is known that if two banknotes do not match in any of the

9

figures, then they are of different colors. Bill

122222222

is red,

222222222

is green, what color is bill

123123123

Problem Statement