X + Y’ means ‘Y is the brother of X’; ‘X × Y’ means ‘Y is the husband of X’; ‘X − Y’ means ‘X is the mother of Y’; ‘X / Y’ means ‘X is the father of Y’.
Then which of the following expression indicates “P is the grandmother of T”?
🎥 Video solution / Text Solution of this question is given below:
$P \times Q / R - T$ :
- $P \times Q$ ⇒ Q is husband of P ⇒ P is wife of Q.
- $Q / R$ ⇒ Q is father of R ⇒ R is child of (Q,P) ⇒ P is mother of R.
- $R - T$ ⇒ R is mother of T.
Therefore P (mother of R) is **grandmother** of T.