# How many different permutations are there of the letters in

How many different permutations are there of the letters in the word MISSISSIPPI?
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Explanation:
$1M+4i+4S+2P$
$\frac{11!}{1!4!4!2!}=\frac{11\cdot 10\cdot 9\cdot 8\cdot 7\cdot 6\cdot 5}{4\cdot 3\cdot 2\cdot 2}$
$=11\cdot 10\cdot 9\cdot 7\cdot 5$