Revision Notes for Part A: Mastering the Concept of Blood Relation (Download PDF)

Concept of Reasoning: BLOOD RELATIONS

Blood relation questions consist of indirect information given between two persons, and that information can be established by reading all the pieces of information. We can solve the Blood relation question by making the diagram of the information given in the question. Some of the blood relations which are generally used in the question are,

• We cannot decide the gender of a person by
• We have to decide the sign assigned to males as well as females.

After that, we gather the information step by step and try to make the diagram from the following data

Some Common Type of Questions Asked in The Exam-

1. Direct Blood Relation
2. Puzzle based Blood relation
3. Counting the total number of males and females
4. Coded Blood relation

Below we are going to share the types of series with examples to explain it-

Direct Blood Relation

1. In a family of seven persons. B is the brother of A and the son of C. D is the son-in- law of C, who has two grandchildren E and F. A is the mother of F and F is the niece of G. E is the son of G. If C has two children, how is E Related D?

1. Brother-in-law
2. Son
3. Cousin
4. Nephew

 Ans. D

Sol.

Given text in the question can be represented in the following diagram-

So, C has two children i.e., B and A because its given that B is the brother of A and also A must be a female and married to D because D is the son-in-law of C. Here G might be the cousin of B so E will be the nephew of D.

Hence, option (D) is the correct response.

2. Saksham introduced Nidhi to his friend, “she is the daughter of the only son of my father’s wife.” How is saksham related to nidhi?

1. Brother
2. Cousin
3. Son
4. Father

Ans. D

Sol.

Therefore saksham is the on nidhi . Hence, option (D) is the correct answer.

Puzzle Based Blood Relation

1. A family consists of six members A, B, C, D, E and F. There are two married couples and three generations. B is a doctor and the father of E. F is the grandfather of C and C is a contractor, D is a mother of B and grandmother of C. How is Contractor related to D?

1. Grandson
2. Granddaughter
3. Son
4. Can’t be determined

Ans. D

Sol. Different symbols used to draw a family tree,

Six members A, B, C, D, E and F. There are two married couples.

As we can see ’s C is a contractor and C’s gender is not definite therefore either C is grandson or granddaughter of D.

Hence, it can’t be determined.

Counting the Total Number of Males and Females

1. A Family has a man, his wife, their four sons and their wives. The family of every son also has 3 sons and one daughter. Find out the total number of male members in the whole family.

1. 4
2. 8
3. 12
4. 17

Ans. D

Sol.

The male members in the family are: (i) the man himself; (ii) his four sons; and (iii) his (3x4) = 12 grandsons. Hence, total number of male members = (1 + 4 + 12) = 17

2. In a joint family, there are father, mother, four married sons and two unmarried daughters. Three sons have 2 daughters each and one has a son. How many female members are there in the family?

1. 13
2. 8
3. 11
4. 12

Ans. A

Sol.

There are 13 female members in the family. They are;

Mother = 1

Wives of 4 sons = 4

2 daughters each of 3 sons = 6 Unmarried daughters = 2

Thus total will be 13 Hence, option A is correct.

2. In a joint family, there are father, mother, four married sons and two unmarried daughters. Three sons have 2 daughters each and one has a son. How many female members are there in the family?

1. 13
2. 8
3. 11
4. 12

Ans. A

Sol.

There are 13 female members in the family. They are;

Mother = 1

Wives of 4 sons = 4

2 daughters each of 3 sons = 6 Unmarried daughters = 2

Thus total will be 13 Hence, option A is correct.

Coded Blood Relation

1. A+B means A is the father of B. A-B means A is the sister of B. A*B means A is the brother of B. A%B means A is the son of B. In the expression: T%S*K+D-M, How’s T related to M?

1. Sister
2. Brother
3. Cousin
4. Uncle

Ans. C

Sol.

It's given that: A+B means A is the father of B. A-B means A is the sister of B. A*B means A is the brother of B. A%B means A is the son of B.

Therefore, the expression T%S*K+D-M can be represented as given below in the diagram:

From the above figure, it's clear that T is the cousin of M. So, the correct answer is option C.

2. A + B means ‘A is the mother of B’

A − B means ‘A is the father of B’

A × B means ‘A is the sister of B’

A ÷ B means ‘A is the daughter of B’

If P + R × T − Q ÷ S + U, then how is S related to T?

1. Sister
2. Daughter
3. Wife
4. Mother

Ans. C

Sol. It is clear from the above diagram, that S is the wife of T. Hence, option (C) is correct.

 Download the PDF on Blood Relations - Click Here to Download

~ Kindly UPVOTE this article and share it with your friends.

→ If you have any questions feel free to ask in the comments section below.

Increase Your Chances to Crack JRF by 100% - Join Online Classroom Program

BYJU'S Exam Prep Team

Download the BYJU’S Exam Prep App Now. 

The Most Comprehensive Exam Prep App.

#DreamStriveSucceed

App Link: https://bit.ly/3sxBCsm