Directions : Read the following information carefully and answer the following…
2020
Directions : Read the following information carefully and answer the following question.
If
(i) P & Q means P is the brother of Q.
(ii) P % Q means P is the father of Q.
(iii) P * Q means P is the sister of Q.
(iv) P @ Q means P is the son of Q.
(v) P $ Q means P is the daughter of Q.
(vi) P ? Q means P is the mother of Q.
In the expression Q & G, G & A % C & D ? E * F @ H @ R, how is F related to A?
- A.
Son
- B.
Grandson
- C.
Granddaughter
- D.
Either Grandson or Granddaughter
- E.
Either Son or Grandson
Attempted by 4 students.
Show answer & explanation
Correct answer: B
Concept
In symbolic blood-relation problems, every link "P <symbol> Q" is read left-to-right as a single statement: P holds that relation to Q. Decode each symbol one at a time, then stitch the statements into a family tree. Track two things separately: the generation (parent / child / sibling level) and the gender, which is fixed by gendered relations such as son, daughter, father, mother, brother and sister.
Application
Decode the chain link by link:
A % C -> A is the father of C, so A is a parent of C.
C & D -> C is the brother of D, so C and D are siblings; therefore A is also a parent of D.
D ? E -> D is the mother of E, so D is a parent of E (and D is female).
E * F -> E is the sister of F, so E and F are siblings; therefore D is a parent of F as well.
F @ H -> F is the son of H, which fixes F as male.
Cross-check
Walk the line of descent from A down to F: A is a parent of D, and D is a parent of F. That is exactly two generations, so A is a grandparent of F. Since F is male (F is a son), F is the grandson of A. The links G & A (G is A's brother) and H @ R (H is the son of R) sit outside this line of descent and do not change the F-to-A relation.
Result: F is the grandson of A.