Question

There are infinite black and white dots on a plane. Prove that the distance between one black dot and one white dot is one unit.

A question asked during an interview for a technology analysts role at Goldman Sachs. If you know the answer, you probably should be working for NASA.​

Answer 1

Answer: faults

Explanation: 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.