I already answered this, both with this misspelling as well as the correct spelling. Assuming that you really meant this misspelling "MISSISIPI", the 3 things M,SSS,P can be arranged in 3! = 6 ways: M SSS P M P SSS SSS M P SSS P M P M SSS P SSS M Then the 4 I's can be placed only 1 way in each of those so that no I's come together: IMISSSIPI IMIPISSSI ISSSIMIPI ISSSIPIMI IPIMISSSI IPISSSIMI Answer: 3!*1 = 6 Edwin