Find the missing number?

The diagram below represents the students who study Physics, Chemistry and Mathematics. Study the diagram and identify the region which represents students who study both Physics and Chemistry but not Mathematics?

Directions: In each of the following questions, four words have been given, out of which three are alike in some manner and the for one is different. Choose out the odd one. 

Directions: Each of the questions below consists of a question and two statements numbered I and II given below it. You have to decide whether the data give in statements are sufficient to answer the question. Read both statements and choose the most appropriate option.
Give Answer
(A) If the data in statement I alone is sufficient to answer the question while the data in statement II alone is not sufficient to answer the question.
(B) If the data in statement II alone is sufficient to answer the question, while the data in statement I alone is not sufficient to answer the question.
(C) If the data either in statement I alone or in statement II alone is sufficient to answer the question.
(D) If the data even in both the statements I and II together are not sufficient to answer the question.
(E) If the data in both the statements I and II together are necessary to answer the question.

P, Q, R, S and T are standing in a row. Who is standing at the left end of the row?
I. There are three persons between P and T.
II. R is to the immediate left of T, S is to the immediate right of P. R and S are not adjacent to each other.

Directions: In each of these questions, three words are related in some way. The relationship among the words in the question can best be represented by one of the five diagrams (a), (b), (c), (d) and (e) given below. Mark your answer accordingly.

Iron, Lead, Nitrogen  

In the given figure, How many books are fiction?

Six Friends-A,B,C,D,E and F are sitting on a hexagonal table to play a game, but not necessarily in the same order. F is exactly in front of A, who is exactly at the right side of B. D is in the middle of F and B and Exactly in front of C.

Between persons of which pair from the following, A is sitting?

Direction: Select the related word from the given alternatives.

11 : 169 :: 18 : ___