1, touch a 6, if 6 is ten digits, then touch (2, 4, 8) and three of the remaining eight are even numbers, so the possibility is 3/8, then the remaining five are odd numbers, so the possibility of odd numbers is 5/8.

2. Because the possibility of touching the pencil is 1/4, the total number is a multiple of 4, which means the total number may be 4 or 8. (**7 possibilities)

The total time is 4 hours: pencil: 1, pen: 1, ballpoint pen: 2;

Pencil: 1, pen: 2, ballpoint pen: 1.

The total number is 8: 2 pencils,/kloc-0 pens and 5 ballpoint pens;

Pencils: 2, pens: 2, ballpoint pens: 4;

Pencils: 2, pens: 3, ballpoint pens: 3;

Pencils: 2, pens: 4, ballpoint pens: 2;

Pencils: 2, pens: 5, ballpoint pens: 1.

(3) There are four two-digit numbers composed of three cards: 50, 52, 20 and 25, and there are two at the end of 0, so the possibility is 2/4, which means 1/2.