Eight people, D, E, G, H, M, N, Y and Z are sitting in a straight line, facing north. Y sits at one of the extreme ends of the line. Only three people sit between Y and Z. E sits second to the right of Z. Only three people sit between E and D. G sits at one of the positions to the left of D but not at an extreme end of the line. M is not an immediate neighbour of Z. N sits second to the right of H. How many people sit to the left of H?

Given : Eight people, D, E, G, H, M, N, Y and Z are sitting in a straight line, facing north.

Explanation : 

1) Y sits at one of the extreme ends of the line.

2) Only three people sit between Y and Z.

3) E sits second to the right of Z.

4) Only three people sit between E and D.

As definite position of Y is not known yet therefore, there are two possible positions for Y.

• Case - (1) :

• Case - (2) :

4) G sits at one of the positions to the left of D but not at an extreme end of the line.

5) M is not an immediate neighbour of Z.

6) N sits second to the right of H.

As in case - (2) only possible position for G is at the left end but according to the given condition G cannot e positioned at any of the ends therefore case - (2) is eliminated.

•   Case - (1) :

Thus, according to the final arrangement three people i.e Y, G and D sits to the left of H.

Hence, "Three" is the correct answer.