(a) If any nine letters of the 27-letter Spanish alphabet could be used to form a nine-letter word, how many words would have at least one repeated letter?

College Algebra
10th Edition
ISBN:9781337282291
Author:Ron Larson
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Chapter8: Sequences, Series,and Probability
Section8.6: Counting Principles
Problem 3ECP: A combination lock will open when you select the right choice of three numbers (from 1 to 30,...
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(a)
If any nine letters of the 27-letter Spanish alphabet could be used to form a
nine-letter word, how many words would have at least one repeated letter?
(b)
A computer access password consists of from three to ten letters chosen from
the 28 in the Arabic alphabet with repetitions not allowed. How many different
passwords are possible?
Transcribed Image Text:(a) If any nine letters of the 27-letter Spanish alphabet could be used to form a nine-letter word, how many words would have at least one repeated letter? (b) A computer access password consists of from three to ten letters chosen from the 28 in the Arabic alphabet with repetitions not allowed. How many different passwords are possible?
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