Anagrams of LOLLIPOP
How many distinguishable arrangements of the letters in begin and end with the same letter? (For example, counts - it starts and ends with .)
Show hints (2)+
- The boundary letter must repeat: only , , or qualify. Handle each case separately.
- For each, count distinct permutations of the remaining six middle letters (a multinomial), then add.
Answer
Reveal answer →Final answer
300
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Asked at: Jane Street, Citadel