RRB RPF Constable 03 Feb 2019 Solved Paper

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Question : 90 of 120
 
Marks: +1, -0
Read the following statements and then answer the given question.
A4B means A is the mother of B,
A3B means A  is father of B.
A5 B means A  is sister of B.
A7B means A  is brother of B.
equation P3Q5R7S, what is the relation of P to S is?
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