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20 12 how to solve the problem of Fengtai mathematical model for Beijing senior high school entrance examination 12?
Hello, maybe my method is not particularly good, for reference only.

This is a periodic problem, so finding the period is the key.

The arrangement of typing letters is as follows: d b c c b d a a, the cycle seems to be too long, with 8 letters per cycle.

So the number 10 is B, and the number 20 12\8 is 4, so the number 20 12 is C.

If there is a better way, please tell me, thank you!