How many permutations are there of the 11 letters in MISSISSIPPI
all the l's not come together?

Explanation

There are. 11 letters, of which `M` appears 1 time, I appears 4 xx, `S` appears 4 xx and `P` appears 2 . xx. Total number of words `=11 !/(4 !)(4 !)(2 !) doteq 34650`
Number of words with all I.s come together `=8 !/4 ! 2 !=840`
`therefore` Number of words with all I.s not together
`=` Total number of w.ords `-` Number of words with all I.s come together `=34650-840=33810`