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

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

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

5 letters can be posted into 3 letter boxes in:

5 letters can be posted into 3 letter boxes in:

Find the number of ways in which 5 letters can be posted in 3 post boxes if any number of letters can be posted in a post box.

Three letters can be posted in five letter boxes in 3^(8) ways.

Three letters can be posted in five letter boxes in 3^(8) ways.

Three letters can be posted in five letter boxes in 3^(5) ways.