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Rearrangements of LOLLIPOP with matching ends

Question

Count the distinct arrangements of the eight letters of the word LOLLIPOP whose first and last letters are the same. (For example, LOLIPOPL qualifies.)

Short answer

300300. LOLLIPOP has three L, two O, two P and one I. With L at both ends the middle six letters (L, O, O, P, P, I) can be arranged in 6!2! 2!=180\tfrac{6!}{2!\,2!}=180 ways. With O at both ends, or P at both ends, there are 6!3! 2!=60\tfrac{6!}{3!\,2!}=60 ways each. I cannot be at both ends, so the total is 180+60+60=300180+60+60=300.

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