BALLOON arrangements bookended by vowels
How many distinct arrangements of the letters in BALLOON begin and end with a vowel? (The vowels available are the letters A, O, O.)
Show hints (2)+
- Split on which vowels sit at the two ends - the repeated O forces cases.
- Both-O ends (1 way) vs A-and-O ends (2 orders), each times the middle arrangements .
Answer
Reveal answer →Final answer
180
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Asked at: Game-Based Aptitude, ETF Market-Making