MISSISSIPPI with the P's together

How many distinct arrangements of the letters in MISSISSIPPI have the two P's adjacent to each other?

Show hints (2)+
  1. Glue the two P's into one block; gluing turns 11 letters into 112+1=1011-2+1=10 items.
  2. 10!/(4!4!)10!/(4!\,4!) - no extra 2!2! since the P's are identical.

Answer

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6300

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Asked at: Multi-Strategy Quant, Data-Driven Research

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