1. A bag contains 5 red marbles, 4 green ones, 3 white ones, and 2 purple ones. Michelle reaches into the bag and grabs 6 of the marbles.
   1. How many sets of 6 marbles are there?
   2. Find the probability that Michelle has 3 red ones and 1 of each of the other colors.
   3. How many sets of marbles include none of the red ones?
   4. What is the probability she selects all of the purple ones?

How many sets of marbles include at least 2 white ones?