Question

In how many ways can 9 letters be posted in 4 letter boxes

Answer 1

Here is the required answer

Answer 2

Answer:

Step-by-step explanation:

Assuming that each mailbox is distinguishable and that each letter is distinguishable, then the problem can be solved by allowing each letter to “choose” its mail box. Thus, for each of the 9 letters there are 4 choices, so the result is 4^9.