What is the probability that four 'S' comes consecutively in the word 'MISSISSIPPI` when rearranged?

What is the probability that four S's come consecutively if all the letters of the word 'MISSISSIPPI' are rearranged randomly?

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

If the letters of the word ASSASSINATION are arranged at random.Find the probability that (i) Four S's come consecutively in the word. (iii) Two I's and two N's come together.(ii)All A's are not coming together.(iv)No two A's are coming together.

Find the probability that the 3Ns come consecutively in the arrangement tof the letters of the word CONSTANTINOPLE.

A coin is tossed 10 times. What is the probability of getting exactly 7 consecutive tails, no two other tails being consecutive?