In the small country of Zog, each person owns one and only one car. Every licence plate of the car is different and each one contains only one letter and one one-digit number including zero. How many people live in the land of Zog, assuming every licence plate is used?
Answer
520
26 (letters of the alphabet) X 10 (1-digit numbers 0-9) = 260
That’s only if each letter is before the number, but since it can be after, you have to double that.
260 X 2 = 520.
