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There are 20 jelly pieces of 5 different brands in the box. If you pick out 6 jelly pieces at random, 2 of them must be of the same brand. Why?

Because 16 jelly pieces are of the same brand, and the remaining 4 jelly pieces are of different brands.

A card (16) B card (1) C card (1) D card (1) E card (1)

As mentioned in the question, randomly draw out 6 jelly pieces , even if different brands of BCDE are drawn, there are still

2 limits left, and the A jelly drawn at this time must be the same brand of A jelly

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