Verbal Reasoning - Blood Relation Test - Discussion

The correct one is M x N - C + F.

Read it from left to right.

M x N → M is the father of N
(M is the dad of N)

N - C → N is the sister of C (N is sis of C, so C must be a boy)

C + F → C is the brother of F(confirms again, C is a boy)

Let’s pull it all together;
M x N → M is dad of N.

N - C → N is the sister of C → So C is also a child of M, since N and C are siblings, and M is the dad.

C + F → C is the brother of F → confirms C is male.

So C is the son of M.

Final Breakdown:
Person -- Relation
M -- Father
N -- Daughter
C -- Son (our target 🎯)
F -- C's sibling (no gender needed)

So, the Final answer:
M x N - C + F.
C is the son of M!

A is bro of B (if +),
A is sis of B ( if -) ,
A is the father of B (if x).

The question says what equation says the C is the son of M.

By Cross-checking, we got a hint. (A × B - a is the father of B)

Our question is to check whether C is the son of M.
Or (M is the father of C)

So, Option D is correct.

Why not Option A? Please explain.

I think it's Option A.

Thanks all for explaining the answer.

Ans D is correct.
M is F of N ;
N is Sis of B;
So, C is the brother of B.

Please explain this one.

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.

Option A is also the right answer.

Thank you @Vikas Saini.