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Mathematical pigeon coop principle
According to pigeon coop principle;

(1) The worst result is 2:2:2:2. If you take another one, there must be three colors in the same color, so it is 9.

(2)

The worst grades A to K are 2 yuan each and ***26 yuan. At this time, if you take another piece, there will be three pieces of the same number, so it is at least 27 pieces.