How many 13-letter words contain exactly 3 vowels? (For example, an 8-le with 5 vowels is “aaioobtt”; don't consider “y” a vowel for this exercise.) What if repeated letters were not allowed?
How many 13-letter words contain exactly 3 vowels? (For example, an 8-le with 5 vowels is “aaioobtt”; don't consider “y” a vowel for this exercise.) What if repeated letters were not allowed?
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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Transcribed Image Text:How many 13-letter words contain exactly 3 vowels? (For example, an 8-letter word
with 5 vowels is "aaioobtt”; don't consider "y" a vowel for this exercise.)
What if repeated letters were not allowed?
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