5 letters are written and there are five letterboxes. The number of ways the letters can be dropped into the boxes are

The number of ways in which 10 letters can be posted in 5 letter boxes is

5 letters can be posted into 3 letter boxes in:

5 letters can be posted into 3 letter boxes in:

The number of ways in which 5 letters can be posted in 10 letter boxes is

6 letters are to be posted in three letter boxes. The number of ways of posting the letter when no letter box remains empty is

There are 6 letters and 3 post boxes. The number of ways in which these letters can be posted is -

The number of ways in which 10 letters can be posted in five letter boxes is

In how many ways 5 letters can be posted in 4 letter boxes?

In how many ways 5 letters can be posted in 4 post boxes.