7. At the DVD rental store, Jamie found 6 DVD's that she wanted, but can only rent 4. How many possible choices can she make? 8. Find the total number of different 4-digit numbers using all the digits in the number 4129. (Can't repeat digits) 9. There are 6 boys and 6 girls in the finals of the talent contest. A contest is held to pick the top three winners in both the boy and girl groups in order of talent. How many different options for winners are there? 10. 2 six-sided dice, one green and one red, are released. Find the probability that each die shows a score of 5. 11. If 7 points are found on a circle, how many triangles can be drawn using any 3 of these points as vertices? 12. A certain big company classifies its employees according to gender, age group (6 categories) and employment type (10 categories). how many classifications are there?