The English alphabet contains 21 consonants and five vowels. How many strings of six lowercase letters of
Question:
a) Exactly one vowel?
b) Exactly two vowels?
c) At least one vowel?
d) At least two vowels?
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We need to be careful here because strings can have repeated letters a We need to choose the positio...View the full answer
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Related Book For 
Discrete Mathematics and Its Applications
ISBN: 978-0073383095
7th edition
Authors: Kenneth H. Rosen
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