Verbal Reasoning - Blood Relation Test - Discussion


If A + B means A is the brother of B; A - B means A is the sister of B and A x B means A is the father of B. Which of the following means that C is the son of M?

[A]. M - N x C + F
[B]. F - C + N x M
[C]. N + M - F x C
[D]. M x N - C + F

Answer: Option D


M x N → M is the father of N

N - C → N is the sister of C

and C + F → C is the brother of F.

Hence, M is the father of C or C is the son of M.

Vikas Saini said: (Oct 16, 2010)  
The text may look as lengthy but it will be very helpful to solve the relation related questions and save your time also.

The trick to solve the question is as follows:
Step 1: make out the conditions from the question, for example in this question it says ''c is the son of M''. here we can configure the conditions as follows-
Condition 1- c must be a male in the equation.
COndition 2- M should be father or mother in the equation.

Based on these conditions we can filter the options and the remaining conditions can be checked finaaly to confirm the answer. for example in this question :

1st option: c+f means c is brother of F. it confirms that c is a male. and M-N means M is sister of N, here M is neither a father nor mother, so this condition we can take it as a wrong and can avoid it.

2nd Option: C+N means C is brother of N, it confirms that C is a Male. N*M, here M has came in last, so we can not determine the sex of M. So this Option also we can filter out.

3rd Option: F*C means C came in last of the equation and we can not determine the sex of the C. this also we can filter it out.

the remaining option is four. so we can check the fourth option to check it is correct.

Basically on the basis of the question we have to make the conditions and on the basis of these condition we have to filter out the options.

Do practice of it, and you will find very easy to solve these types of questions.

R.Rajapriyanga said: (Jan 19, 2011)  
If the c is daughter of m the answer will be b but c is son of m so the answer is d.

Manju said: (Feb 21, 2011)  
Thank you Saini! Well said.

Wonderful trick to solve the blood relations.

Deepu said: (Feb 25, 2011)  
Hey! the way you have explained the anserr is awesome. Thanks a ton.

Sanjay Bisht said: (Nov 8, 2011)  
Hello Vikas i din't get that line "F*C means C came in last of the equation and we can not determine the sex of the C" Plz.. Explain It

Hema said: (Jan 13, 2012)  
Nice trick to solve this one.

Anshu said: (Mar 31, 2012)  
@ Vikas Saini.

That's the correct way to solve these sorts of problem! I always go in this way. I would also like to suggest if you don't mind.

Try to make a rough diagram in these sorts of sum it easiens the question and allows you to answer in better way. Hope it helps you.

Charan said: (Aug 24, 2012)  
@ Vikas Saini.

But how to solve this problem if there r no options.. plz mention the detailed procedure as i am preparing for descriptive exam..hav to mention the steps also...

Vinay said: (Sep 17, 2012)  
@Sanjay Bisht.

As the A B are actually in order
So I think the letters whch are given in options also should be taken in order. Which means F*c is given whch is wrong in alphabitical order. and same for N*M also
if it was like (C*F)as(A*B)then c would have also considered as father of F....but it is given as F*C which is wrong in alphabetical order. So it ruled out.

Prasanna said: (Dec 17, 2012)  
Can somebody explain essay steps to identify the blood relation ?

Mohit said: (Mar 12, 2015)  
Dear @Saini as you said,

Condition 2- M should be father or mother in the equation.

So what about answer no. 2.

Asilesha said: (Jul 4, 2015)  
Even if the C is the daughter of M, then answer can't be B. Draw the family tree diagram for it.

Answer is D @Vikas.

Thanks for explaining this method.

Ishika said: (Jul 9, 2015)  
According to me the answer should be cousin.

Guru said: (Aug 28, 2015)  
Awesome tricks.

Kumar Shantanu said: (Sep 2, 2015)  
If A + B means A is the father of B; A - B means A is the brother B; A % B means A is the wife of B and A x B means A is the mother of B, which of the following shows that M is the maternal grandmother of T?

A. M x N % S + T B. M x N - S % T.

C. M x S - N % T D. M x N x S % T.

How we will solve this?

Divy said: (Sep 29, 2016)  
We must draw diagrams to make the Question easier and to find the answer.

Naveen said: (Oct 10, 2016)  
I think 1st option also correct M - N * C + F.

Rohit said: (Oct 14, 2016)  
First option clearly indicates the relation and in option D gender is not confirmed so I think option one is correct.

Omi said: (Nov 7, 2016)  
Thank you @Vikas Saini.

Sowji said: (Feb 20, 2017)  
Nice explanation @Vikas.

Husain said: (Mar 13, 2017)  
Thank you @Vikas Saini.

Daisy said: (Apr 22, 2017)  
Thank You for the given explanation.

Anwesha said: (May 4, 2018)  
M may be father or mother of c. So why not the option 2 is correct?

Mithila said: (Jun 3, 2018)  
Thanks @Vikas Saini.

Prakashika said: (Aug 18, 2018)  
Option 1 M - N * C + F is also correct right?

Bolla Kasee said: (Oct 7, 2018)  
How C comes last of the equation? Could you please Give give me a clarity?

Nancy Asmitha said: (May 25, 2019)  
Please explain the answer in detail.

Rohini Shaiva said: (Aug 29, 2019)  
Thank you @Vikas Saini.

Deepak Saini said: (Oct 1, 2020)  
Option A is also the right answer.

Gopal said: (Aug 4, 2021)  
M has one daughter (N) and one son is (C) and C is the brother of F (gender not clear).
As M has three child,
In this condition 4 option is correct.

Pavan said: (Aug 23, 2021)  
Please explain this one.

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