Answer:
How do you prove that the distance between one black dot and one white dot is one unit? You don't, because it's false. If all black dots happen to be on the line and white dots on the line (and the rest of the plane is neither white nor black), there is no such pair.
Step-by-step explanation:
That is the easiest question to ask and the hardest question to ask and for me to answer, but I am 98% sure that is correct. That is impossible for that to happen. I should say that it is undefined.