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Question:
In how many ways can the letters of the word ASSASSINATION be arranged so that all the Ss are together ?
Answer:

Given word is :  ASSASSINATION

Total number of words  = 13

Number of A : 3

Number of S : 4

Number of I :  2

Number of N : 2

Number of T : 1

Number of O : 1

Now all S are taken together. So it forms a single letter.

Now total number of words = 10

Now number of ways so that all S are together = 10!/(3!*2!*2!)

                                                                        = (10*9*8*7*6*5*4*3!)/(3! * 2*2)

                                                                        = (10*9*8*7*6*5*4)/(2*2)

                                                                        = 10*9*8*7*6*5

                                                                        = 151200

So total number of ways = 151200

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