2. You work at a crayon factory and you're really tired. It's your job to pack boxes of crayons. You have 10 different colors of crayons available to you, and each box holds exactly 20 crayons. (a) How many different boxes of crayons can you produce if you don't care how many crayons of each color there are? (So some unlucky kid can get a box with 20 crayons that are the same color). (b) How many different boxes can you produce if you want there to be at least one of each color in the box? (c) How many different boxes can you produce if you want there to be exactly three yellow crayons and at least ten red crayons in the box? (d) How many different boxes can you produce that have exactly three yellow crayons or at least ten red crayons in the box?