Six friends A, B, C, D, E and F are sitting in a row facing East. 'C is between 'A' and 'E'. 'B' is just to the right of 'E' but left of 'D'. 'F' is not at the right end. How many persons are to the right of 'E'?

According to question,
We can draw a figure , in which C is between A and E. B is just to the right of E but left of D. F is not at the right end.
From it is clear that , D is at the right end .
Sitting arrangement :-

According to question,
We can draw a figure , in which M is on the right of N and P is on the left of O .
From it is clear that ,N and P are partners.
Sitting arrangement :-

According to question,
We can draw a figure , in which P is to the left of M and to the right of O. R is sitting to the right of N, but to the left of O.
From it is clear that , O is sitted in the middle.
Sitting arrangement :-

According to question,
Black coloured bus is standing in the immediate right of Red. Green colour is between Blue and Yellow. Yellow colour is between Black and Green.
Therefore ,Yellow coloured bus is standing in the middle .
Sitting Sequence :-

According to question,
We can draw a figure , in which A is in the middle of B and E, D is to the right of E and left of C.
Hence ,B is to the immediate right of C.
Sitting arrangement :-

According to question,
We can draw a figure , in which D is on the left of C and B is on the right of E. A is on the right of C and B is on the left of D. If E occupies a corner postion.
As shown in figure , D is sit in the centre .
Sitting sequence :-

Draw a figure on the basis of above given question ,
Bus M is standing at the front and Q is standing at the back end. Bus N stands between M and O. Bus P stands between O and Q.
From figure , Bus O is in the middle of the five.
Sitting arrangement :-

According to question,
We can draw a figure , in which A is facing B, B is to the right of E and left of C. C is to the left of D. F is to the right of A. Now D exchanges his seat with F and E with B.
From it is clear that , A is to the left of D.
Sitting sequence :-

According to question,
We can draw a figure , in which E and F are in the centre and A and B are at the ends. C is sitting on the-left of A.
From given figure it is clear that , D is sitting on the right of B.
Sitting arrangement :-

According to question,
We can draw a figure , in which C is to the left of D, F is between A and E, and E is between F and D.
From it is clear that , E is to the left of F.
Sitting sequence :-