what is the last one?

College Algebra
1st Edition
ISBN:9781938168383
Author:Jay Abramson
Publisher:Jay Abramson
Chapter9: Sequences, Probability And Counting Theory
Section9.5: Counting Principles
Problem 54SE: How many unique ways can a string of Christmas lights be arranged from 9 red, 10 green, 6 white, and...
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what is the last one?

How many 2-letter code words can be formed from the letters O, Z, A, I, M if no letter is repeated? If letters can be repeated? If adjacent letters must be different?
There are 20 possible 2-letter code words if no letter is repeated.
(Type a whole number.)
There are 25 possible 2-letter code words if letters can be repeated.
(Type a whole number.)
There are 15
possible 2-letter code words if adjacent letters must be different.
(Type a whole number.)
Transcribed Image Text:How many 2-letter code words can be formed from the letters O, Z, A, I, M if no letter is repeated? If letters can be repeated? If adjacent letters must be different? There are 20 possible 2-letter code words if no letter is repeated. (Type a whole number.) There are 25 possible 2-letter code words if letters can be repeated. (Type a whole number.) There are 15 possible 2-letter code words if adjacent letters must be different. (Type a whole number.)
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