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asked in Logical Reasoning by (34 points)  
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is it option D
Yes .. can you please explain the question in detail?

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Guven Z is Grand Father Of S This can be happened only if P is married to R or Q is married to R

 A)X is mother in law of R  ( as Gender is not given so X can be mother in law of R)  --------- May be True

B)P and R are not married to each other (We can't say whether PR are married or QR are married since S is grand Daughter of Z)

   so Option B May be True

C) P is Son of X and Y ( as P gender is not given, P can be son) ------ May be True

D) Q can't Married to R ( Q May Marry R if Q and R are Opposite genders ) ----- This is false

So Option D

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But Z is grandfather of S who is Daughter of P.. this means that P and R married
Ya even if QR married then S becomes daughter or niece to Q then also Z becomes grandfather to S
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