How many even numbers can be composed of 1, 2, 3 and 4? It is not said that they must be even numbers of four digits

Because it is even, the number of bits is 2 or 4;
When it's a single digit, there are two;
When it is a two digit number, the number of species = 2 × 3 = 6;
When it is three digit, the number of species is 2 × 3 × 2 = 12;
When it is four digit, the number of species = 2 × 3 × 2 × 1 = 12;
So the total number of species is 2 + 6 + 12 + 12 = 32;
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