Question

How many three-letter "words" can be made from 6 different letters "FGHIJK" if... a) Repetition of letters is allowed? b) Repetition of letters is not allowed? 

          How many three-letter "words" can be made from 6 different letters "FGHIJK" if...
a) Repetition of letters is allowed? 
b) Repetition of letters is not allowed?

Added by Pamela A.

Probability with Applications in Engineering, Science, and Technology
Probability with Applications in Engineering, Science, and Technology
Matthew A. Carlton • Jay L. Devore 2nd Edition
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How many three-letter "words" can be made from 6 different letters "FGHIJK" if... a) Repetition of letters is allowed? b) Repetition of letters is not allowed?
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Transcript

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00:01 In this problem, we are given that there are six different letters, which are f, g, h, i, j, and k.
00:08 And we are required to find out the number of three letter words, which can be made out of these six letters, provided that in the first case, the repetition of the letters, that's allowed.
00:24 And in the next case, the repetition is not allowed.
00:28 So if the reputation is allowed, then each letter for the three -letter words can be selected in six different ways, because it could be any letter out of these letters.
00:40 And we see that we need to find the number of three -letter words which can be formed...
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