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

InterviewSolution

1.

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

Answer»

First letter can be posted in any of the 5 letter boxes i.e. in 5 ways.

Similarly,

Each one of the other 3 letters can be posted in any of the 5 letter boxes i.e. in 5 ways.

As,

The operations are dependent,

So,

Total number of ways = 5\(\times\)5\(\times\)5\(\times\)5

= 5⁴.

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