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in Mathematics by (56.2k points)
In how many ways can the letters of the word ASSASSINATION be arranged so that all the S’s are together?

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In the given word ASSASSINATION, the letter A appears 3 times, S appears 4 times, I appears 2 times, N appears 2 times, and all the other letters appear only once. Since all the words have to be arranged in such a way that all the Ss are together, SSSS is treated as a single object for the time being. This single object together with the remaining 9 objects will account for 10 objects.

These 10 objects in which there are 3 As, 2 Is, and 2 Ns can be arranged in 10!/3!2!2! ways.

Thus,

Required number of ways of arranging the letters of the given word =10!/3!2!2!=151200

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