Question

How many four letter words are possible using the first 5 letters of the alphabet if letters can be repeated?

Answer 1

We can have `625` possible four letter words.

Explanation:

As we have first five letters namely `{a,b,c,d,e}`, first letter could be filled in five possible ways.

Now, as letters can be repeated second place too can be filled in five possible ways and so too for third and fourth place.

Hence we can have `5×5×5×5=625` possible four letter words.