Balls in Boxes 
Copyright 2003 by Paul Niquette.  All rights reserved..
onsider two boxes, each concealing three balls.  One box contains two red balls and one black, the other two black balls and one red. 

You are permitted to remove one ball from either box without seeing inside.  A certain puzzler will wager even money that you cannot match the color of a second ball removed from either box with the first ball. 

Will you accept the wager?