There are 3 A’s, 4 S’s, 2 I’s and all other letters appear only once in the word ASSASSINATION. The given word should be arranged such that all the S’s are together.

The 4 S’s can be treated as a single object for time being. This ingle object with the remaining objects will be 10 objects together. These 10 objects with 3 A’s, 2 I’s and 2 N’s can be arranged in \( \dfrac{10!}{2!3!2!}\) ways.

Therefore, number of ways of arranging the given word

= \( \dfrac{10!}{2!3!2!}\) = 15120

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