'Consider 5-letter words again. How many start and finish with vowel? (b) How many have at most one vowel? (c) How many have exactly three vowels with no two vowels next to each other?'
Added by Kelly R.
Step 1
- There are 5 choices for the first vowel and 1 choice for the last vowel. - For the remaining 3 letters in the middle, there are 26 choices for each letter. - Therefore, the total number of words that start and end with a vowel is 5 * 26^3 * 1 = 33,800. Show more…
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