Explanation:

- O is at the left end.

- S is third from the left, so the arrangement starts with O, X, S.

- P cannot be at either end, and R is to the immediate right of P. Thus, P can be fourth or fifth.

- M is second from the right.

- O is not beside N.

Given this information, let's place the houses:

1. O is at position 1 (left end).

2. S is at position 3.

3. M is at position 6 (second from right).

4. P and R must be in positions 4 and 5 respectively.

5. N must be at position 7, but it can't be near O.

The correct arrangement is O, Q, S, P, R, M, N.

- N is at the right end (Option 2).

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