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Solved Examples

Ques: There are three friends A, B, and C, who live in three different cities P, Q and R, they have three different profession Doctor, Lawyer and Engineer, not necessarily in the same order.
  1. A lives in city P and is not a Doctor.
  2. C does not live in city R.
  3. The one who lives in city Q is a Lawyer.
Find out the respective combinations of person, city and profession.

Let us analyze the information given above.
 
First make a table with the respective piece of information, in this question there are three variables in this question – Name, City and Profession
 
Name City Profession
A P → (I) Doctor – X → (II) negative information is marked with a indirect info
B R → C cannot live in R Doctor
C Q R - X (III) Q ↔ Lawyer (IV) there is only one place for Q

Now let’s analyze the statements
  1. A lives in city P → direct information
  2. A is not a Doctor → Negative information
  3. C does not live in city R → Negative information
  4. The one who lives in city Q is Lawyer → information indirect
So the final table looks like
 
A → P → Engineer (∵ A cannot be a Doctor)
B → R → Doctor
C → Q → Lawyer

How to classify information and represent it in the question
  1. Direct information: Put directly in the table
  2. Negative information: Put in the table & mark with a cross and highlight E.g. Doctor –X
  3. Indirect information (without name): mark with a double headed information in the indirect info. Column Q ↔ Lawyer → this implies that the person who lives in Q is a Lawyer and the one who is a Lawyer lives in Q.

Note: As a general rule try to fit in the information which has the most negatives attached to it. Here in this question you should find out city ‘R’ first and the person who is a ‘Doctor’ first. This rule is called ‘MOST NEGATIVE FIRST’

Example 1

Direction

Read the following information carefully and answer the questions that follow:

  1. Five friends P, Q, R, S and T travelled to five different cities of Chennai, Kolkata, Delhi, Bangalore and Hyderabad by different modes of transport of Bus, Train, Aeroplane, Car and Boat from Mumbai.
  2. The person who travelled to Delhi did not travel by boat.
  3. R went to Bangalore by car and Q went to Kolkata by aeroplane.
  4. S travelled by boat whereas T travelled by train.
  5. Mumbai is not connected by Bus to Delhi and Chennai.

 

Example-1

Which of the following combinations of person and mode is not correct?

  1. P-Bus
  2. Q-Aeroplane
  3. R-Car
  4. S-Boat
  5. T-Aeroplane
 
Example-2

Which of the following combinations is true for S?

  1. Delhi-Bus
  2. Chennai-Bus
  3. Chennai-Boat
  4. Data inadequate
  5. None of these
 
Example-3

Which of the following combinations of place and mode is not correct?

  1. Delhi-Bus
  2. Kolkata-Aeroplane
  3. Bangalore-Car
  4. Chennai-Boat
  5. Hyderabad-Bus
 
Example-4

The person travelling to Delhi went by which of the following modes?

  1. Bus
  2. Train
  3. Aeroplane
  4. Car
  5. Boat
 
Example-5

Who among the following travelled to Delhi?

  1. R
  2. S
  3. T
  4. Data inadequate
  5. None of these

 

Solution:

 

The given information can be analysed as follows:
 

Person P Q R S T
Place Hyderabad Kolkata Bangalore Chennai Delhi
Mode Bus Aeroplane Car Boat Train


Example-1. Ans-(e).

 

Example-2. Ans-(c).

 

Example-3. Ans-(a).

 

Example-4. Ans-(b).

 

Example-5. Ans-(c).
 

Example 2

Direction

Read the following information carefully and answer the questions given below:
There are six persons A, B, C, D, E and F in a school. Each of the teachers teaches two subjects, one compulsory subject and the other optional subject. D’s optional subject was History while three others have it a compulsory subject. E and F have Physics as one of their subjects. F’s compulsory subject is Mathematics which is an optional subject of both C and E. History and English are A’s subjects but in terms of compulsory and optional subjects, they are just reverse of those of D’s. Chemistry is an optional subject of only one of them. The only female teacher in the school has English as her compulsory subject.

 

Example-1

What is C’s compulsory subject?

  1. History
  2. Physics
  3. Chemistry
  4. English
  5. Mathematics
 
Example-2

Who is a female member in the group?

  1. A
  2. B
  3. C
  4. D
  5. E
 
Example-3

Which of the following has same compulsory and optional subjects as those of F’s?

  1. D
  2. B
  3. A
  4. C
  5. None of these
 
Example-4

Disregarding which is the compulsory and which is the optional subject, who has the same two subject combination as F?

  1. A
  2. B
  3. E
  4. D
  5. None of these
 
Example-5

Which of the following groups has History as the compulsory subject?

  1. A, C, D
  2. B, C, D
  3. C, D
  4. A, B, C
  5. A, D
 

Solution:

 

The given information can be analysed as follows:

 

Lets assume ‘O’ denote Optional and ‘C’ denote Compulsory-
 

  A B C D E F
History C C C O - -
Physics - - - - C O
Mathematics - - O - O C
English 0 - - C - -
Chemistry - O - - - -


Example-1. Ans-(a).

 

Example-2. Ans-(d).

 

Example-3. Ans-(e).

 

Example-4. Ans-(c).

 

Example-5. Ans-(d).
 

Example 3

Direction

Study the following information carefully and answer the given questions:

 

B, M, T, R, K, H and D are travelling in a train compartment with III-tier sleeper berth. Each of them has a different profession of Engineer, Doctor, Architect, Pharmacist, Lawyer, Journalist and Pathologist. They occupied two lower berths, three middle berths and two upper berths. B, the engineer, is not on the upper berth. The Architect is the only other person who occupies the same type of berth as that of B. M and H are not on the middle berth and their professions are Pathologist and Lawyer respectively. T is a Pharmacist. D is neither a Journalist nor an Architect. K occupies the same type of berth as that of the Doctor.
 

 

Example-1

Who is the Architect?

  1. D
  2. H
  3. R
  4. Data inadequate
  5. None of these
 
Example-2

What is D’s profession?

  1. Pharmacist
  2. Lawyer
  3. Doctor
  4. Engineer
  5. Data inadequate
 
Example-3

Which of the following pairs occupy the lower berth?

  1. BT
  2. BD
  3. BK
  4. Data inadequate
  5. None of these
 
Example-4

Which of the following groups occupies the middle berth?

  1. DKT
  2. HKT
  3. DKR
  4. DHT
  5. None of these
 
Example-5

Which of the following combinations of person-berth-profession is correct?

  1. K-Upper-Lawyer
  2. D-Upper-Doctor
  3. M-Lower-Journalist
  4. R-Lower-Architect
  5. All correct
 

Solution:

 
Passenger B M T R K H D
Berth Lower Upper Middle Lower Middle Upper Middle
Occupation Engineer Pathologist Pharmacist Architect Journalist Lawyer Doctor


Example-1. Ans-(c).

 

Example-2. Ans-(c).

 

Example-3. Ans-(e).

 

Example-4. Ans-(a).

 

Example-5. Ans-(d).
 





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