Select the letter that can replace the question0a mark (?) in the following series.
K, B, N, D, Q, F, T, H,?

Direction: Study the following information and answer the following questions.

Five persons are working in a bank. Their designations are CEO, CFO, Manager, Clerk, and Peon. The sequence of the posts is as above i.e. CEO is the senior most and Peon is the junior most person. They have a different number of pens. No two persons have the same number of pens. Two persons are junior to T. The difference in the number of pens between Y and T is 14 and T has the least number of pens. The one who is just senior to the one who is Manager has 31 pens. V is just senior to the one who has 43 pens. There is one designation between the Manager and Y. V has 11 pens more and 9 pen more than S and M respectively. One designation lies between the one who has 31 pens and V.

How many post are between the person Y and M?

Which letter-cluster will replace the question mark (?) to complete the given series?

abCD, fgHI, ?, stUV, abCD

Direction: Study the following information carefully and answer the questions given below:
Eleven persons buy things one after another. Only five persons buy things after P. Three persons buy things between P and Q. R buy things after S and before T. There are as many persons buy things before U as after V. More than three persons buy things between W and X who buy things just after P. Y buy things before Z and after R. No one buy things after T. Y buy things just after V. U buys after Q.

How many persons buy things between Y and R?

In the following question, select the odd word from the given alternatives.

Identify the diagram that best represents the relationship among the given classes.
Music Instrument, Piano, Guitar

Directions :Study the following information carefully and answer the given questions.
L. M. N, O, P, Q , R and S are sitting around a circular table facing the centre but not necessarily in the same order . P sits third to left of M. P is an immediate neighbour of both o and S. Only one person sits between O and Q. R is an immediate neighbour of O. Only one person sits between R and N. 

Who amongst the following sits exactly between R and N?

Three of the following four numbers are alike in a certain way and one is different. Pick the number that is different from the rest.