Nine people, 1 to 9, are sitting in a straight row, facing the north. 8 is sitting in the middle of the row and his immediate left and right neighbours are 5 and 1, respectively. 9 is sitting at one of the extreme ends and his immediate right neighbour is 2. Only five people are there between 2 and 3. 3 is sitting between 7 and 6. 1 and 7 are immediate neighbours. How many people are there between 4 and 6?

Nine people, 1 to 9, are sitting in a straight row, facing the north

8 is sitting in the middle of the row and his immediate left and right neighbours are 5 and 1

9 is sitting at one of the extreme ends and his immediate right neighbour is 2

Only five people are there between 2 and 3

3 is sitting between 7 and 6

1 and 7 are immediate neighbours

From the given information arrangement will be-

The people seated between 4 and 6 are 5, 8, 1, 7 and 3

So, there are Five (5) people between 4 and 6.

Thus, correct answer is (b)