Since a mother had four sons, North, West and South, the fourth son had a name.
The correct answer is "someone". The question is a simple mathematical puzzle called "sequences". Therefore, he calls for carelessness in the use of logic as required by English.
If we go through logic, logic can name the East as the fourth son. To clarify the matter, the basic knowledge of the layout of a layout should be highlighted with a simple example.
Although this sequence is a compilation of objects that allow the repetition of numbers, questions like puzzles in the form of implications are always in sequence.
Example: A man has been sentenced to death. It has three choices in three bedrooms. There was a fire in the first room. In the other room were five high-pump rifle killers. In the third room were lions that had not been fed for 5 years. Which part is safe for humans?
Answer: The third room is safe because the lions have not been fed for 5 years, which shows that they are dead.
This is the best answer for someone's mother has four sons?