Even country
Probability
Level
pending
In Even Country, the area codes of the telephone numbers consist of three distinct even digits, and none of the area codes are allowed to start with 0 or 8. What is the maximum number of area codes that Even Country has?
The answer is 36.
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1 solution
There are 3 possibilities for the first digit, then 4 possibilities for the second digit, then 3 possibilities for the last digit. Hence, by the rule of product, there are 3 × 4 × 3 = 3 6 possible area codes.