Directions:- Study the following information carefully to answer the question given below.

Seven professors A, B, C, D, E, F and G are engaged in the evaluation of answer papers in three different subjects English, Mathematics and History. At least two persons evaluate the papers in each subject. Each of the evaluators stays in different buildings P, Q, R, S, T, V and W not necessarily in the same order.
A evaluates English papers only with E and stays in building R. D stays in building W and does not evaluate Maths papers. The one who stays in building V evaluates History papers.
B and C do not evaluate the papers in the same subject. Those who evaluate English papers do not stay in building Q. F stays in building P but does not evaluate History papers. G evaluates same papers as F. C stays in building T.

Who stays in building V?

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Solution

The correct option is D B
There are seven professors A, B, C, D, E, F and G of three different subjects English, Mathematics and History to evaluate papers. Each professor stays in different buildings P, Q, R, S, T, V and W.
Condition:-
At least two persons evaluate the papers in each subject.
According to the question, A evaluates English papers only with E. It means A and E both evaluate English papers. The word 'Only' indicates that no other evaluates English papers besides them.
A stays in building R.
D stays in building W.
D does not evaluate maths paper means he evaluates History papers.
G and F evaluate same papers.
B and C do not evaluate the papers of the same subject.
It is given that, F stays in building P but does not evaluate History papers.
It is clear that F evaluates Mathematics papers, so G and F evaluate Maths papers.
C stays in building T.
F stays in building P.
$\begin{matrix} P r o f e s s o r s & S u b j e c t s & B u i l d i n g s A & E n g l i s h & R B & - & - C & - & T D & H i s t o r y & W E & E n g l i s h & - F & M a t h e m a t i c s & P G & M a t h e m a t i c s & - \end{matrix}$
The one who stays in building V evaluates History paper.
B has no subject and no building, so B evaluates History papers and lives in building V.
B $\to$ History $\to$ V
It is given that, B and C do not evaluate papers of the same subject.
So, C evaluates paper of Mathematics
C $\to$ Mathematics $\to$ T
Those who evaluate English paper do not stay in building Q.
So. it is clear that G stays in building Q.
We have only one building left that is S, so it is clear that:-
E $\to$ English $\to$ S
Now on the basis of above informatione we get:-
$\begin{matrix} P r o f e s s o r s & S u b j e c t s & B u i l d i n g s A & E n g l i s h & R B & H i s t o r y & V C & M a t h e m a t i c s & T D & H i s t o r y & W E & E n g l i s h & W F & M a t h e m a t i c s & P G & M a t h e m a t i c s & Q \end{matrix}$

Professor B stays in building V.

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