Another symbol chain — Blood Relations Aptitude Question
Another symbol chain: If A − B means A is the brother of B and A × B means A is the father of B, what does P × Q −… Answer and worked solution on CodeKairo.
- Topic: Blood Relations
- Section: Logical Reasoning
- Difficulty: Medium
- Time target: 75 seconds
Question
If A − B means A is the brother of B and A × B means A is the father of B, what does P × Q − R mean?
Options
- P is the father of R
- P is the brother of R
- P is the uncle of R
- P is the son of R
Show the answer and the worked solution
Correct answer: A. P is the father of R
Worked solution
- P × Q: P is the father of Q.
- Q − R: Q is the brother of R, so they share parents.
- So P is also R's father: P is the father of R.
Answer: P is the father of R.
The idea
The same principle as before with different symbols. Always re-read which letter stands for which relation before starting.
Shortcut. − (brother) keeps the generation, so P, the father of Q, is also the father of Q's sibling R.
Common trap. "P is the uncle of R" — treating 'brother' as a move to another branch of the family; a brother of P's son is P's son, not his nephew.