2. Such issues are generally discussed in the most extreme cases:

Touch a color the first time, touch a color the second time, and touch another one the third time.

So at least10+10+1= 21socks.

The question is how many situations do you have:

The first ball you touch can have two situations: a red ball and a white ball.

The same is true of the second ball, and the same is true of the third ball.

So a * * * has 2×2×2=8 cases.

But half of them are repeated, so 8÷2=4.

4×3+ 1= 13 people

4.( 1). Worst case: Take two kings first, and the number of each suit is (54-2)÷4= 13.

So 2+ 13×3+ 1=42 sheets.

(2) Take two kings first, then take any suit from 2 to A-*** 13, and then take another one, and there must be two equal.

2+ 13+ 1= 16 sheets

5. Pick up from the most places: first take three reds, then three whites, then three yellows, and finally take two blues, choose one color.

3×3+2+ 1= 12.