Seven boxes J, K, L, M, N, O, and P are kept in a stack from top to bottom, but not necessarily in the same order. Box J is kept at the fifth position from the bottom of the stack. Three boxes are kept between M and J. Box K is kept immediately above J. There are two boxes between N and L, where L is kept immediately above box O. Box N is at one of the positions above box L. Which of the following pairs denotes the boxes kept at the topmost and bottommost positions respectively?

Six boxes, A, B, C, D, E and F, are kept one over the other but not necessarily in the same order. B is kept third from the top. Only one box is kept between C and D. B is kept immediately above C. Only three boxes are kept between F and E. D is kept immediately below F. F is not kept at the topmost position. A is kept immediately below E. How many boxes are kept between A and F?

Seven boxes A, B, C, D, I, J and K are kept one over the other but not necessarily in the same order. Only A is kept above I. Only two boxes are kept between I and C. Only K is kept below J. D is not kept immediately above C. How many boxes are kept between B and K?