**Solution:**

The given word is ASSASSINATION

Total no. of letters in ASSASSINATION

In the given word ASSASSINATION, there are 3A’s, 4S’s, 2I’s, 2N’s, 1T’s and 1O’s

The total no. of ways in which these letters can be arranged

**(a)** Four S’s come consecutively in the word

If s comes consecutively then the word ASSASSINATION become.

Therefore, now the no. of letters is

We can write the above equation as

**(b)** Two I’s and two N’s come together

Therefore, now no. of letters is

The required Probability

We can write the above equation as