Question

In how many ways can 5 letters be posted in 3 post boxes, if any number of letters can be posted in all of the three boxes​

Answer 1

Answer:

Since each letter can be put into any of the 3 boxes, then each letter has 3 choices. Thus, the number of ways a person can put 5 letters in 3 boxes is 3 x3x3x3x3 = 3^5.