1. Think of 10 bullets as drawers and 95 rings as elements. Put 95 elements in 10 drawers. 95 divided by 10 equals 9...59+ 1 = 10. There must be at least 1 drawer and 10 drawer.

2. At least 1, the other 45 do the other five kinds of sports respectively.

3.5.

① White, black, white, black, white.

② Black, black, white, white, white (black)

............

No matter how you touch it, you can touch three identical ones.

4. Yes, because 60 ÷ 25 = 2 ...10 2+1= 3.

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