How many different words can be formed by jumbling the letters in the word MISSISSIPPI in which no two S are adjacent?

Other than S, seven letters M, I, I, I, P, P, I can be arranged in 7!2!4!=7⋅5⋅3.Now four S can be placed in 8 spaces in  8C4 ways.Desired number of ways =7⋅5⋅3⋅8C4=7⋅6C4⋅8C4.