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Previous Year Question (PYQs)
4
(i) P ψ Q means P is mother of Q
(ii) P ∈ Q means P is sister of Q
(iii) P $ Q means P is father of Q
(iv) P # Q means P is brother of Q
$\text{Which of the following means X is real grandmother of Y?}$
Solution
$\text{In option (D): }$
$\text{X ψ Z ⇒ X is mother of Z}$
$\text{Z # L ⇒ Z and L are siblings}$
$\text{L \$ Y ⇒ L is father of Y}$
$\text{Hence X is grandmother of Y.}$
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