The general drawing method is: if you draw three pictures, there are six possibilities in the first picture, five possibilities in the second chapter and four possibilities in the third chapter. This ugly time has nothing to do with numbers, so * * is 6*5*4= 120.

Draw 1 12: The first one must be 1, and there are two possibilities. The second chapter has only one possibility after the first chapter, and the third chapter has two possibilities, so a * * * is 2*2 possibilities.

Then the probability of drawing 1 12 is: 4/ 120= 1/30.