Seven people, A, B, C, D, E, F and G, are sitting in a row, facing north. Only three people sit to the left of C. Only D sits to the right of B. Only three people sit between B and F. A sits at some place to the left of G but at some place to the right of E. How many people sit to the right of A?

Six people, A, B, C, D, E and F, are sitting in a row facing north. Only three people are sitting to the right of A. Only one person is sitting between A and C. E is sitting second to the extreme left end of the row. B is not the immediate neighbour of A. F is sitting to the immediate left of B. F is sitting to the immediate right of A. Who is sitting at the extreme left end of the row?

Seven people A, B, I, J, K, L, and O are sitting in a straight row, facing the north (but not necessarily in the same order). No one sits to the right of L. Only three people sit between L and A. Only two people sit between A and O. K sits third to the left of B. I sits to the immediate right of B. How many people sit between J and O?