THIS MONTH'S QUIZ
Each of four marbles is to be placed in one or other of two boxes. Find the number of distinguishable distributions if:
1. all the marbles are different, and the boxes are different;
2. all the marbles are identical, but the boxes are different;
3. all the marbles are different, but the boxes are identical;
4. all the marbles are identical, and the boxes are identical.
