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The number of ways in which all four S come consecutively in the word MISSISSIPPI

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By taking all four S togather and treating them as a single unit. 

Lets count and we have M-1 I-4 S-4 P-2 total of 11 alphabets and by keeping all S togather we have 7+1 alphabets units. 

Which can be used for permutations and it can be simplified to N! 

Where N = 7+1 since all s are identical they are not elligible for their individual permitation so the final answer is 8!

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