1. How many ways are there to arrange 5 monster figurines and 12 angel figurines in a line on a shelf?
2. How many ways are there to distribute three chocolates (one white, one milk, and one dark) to four classmates, at most one chocolate per classmate?
3. How many ways are there to put a star sticker (they come in gold, silver, red, green, and blue) on every student's paper in your class?
4. How many ways are there to give two different catnip toys to five cats, such that no cat gets more than one toy?