1. L is at one of the ends and its not clear which of the end so we have two cases possible.
2. There are three persons between L and Q.
Case I –
3. There are three persons between P and M. P is not at any of the ends and M is to the right of P.
Case I
Here, case II are not satisfied.
So, we have to go with only Case I
N is to the left of R.
Hence, there are two person sits to the left of N.
Thus, the correct answer is “2”.