If R ÷ S means that R is the mother of S, R × S  means that R is the father of S, R - S means that R is the sister of S, then which of the following expressions shows that P is the father of R ?

P × Q - R

Checking from the option, we get the answer from the option (iv):

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Please note:

  l   ⇒ Vertical line shown "generation gap".

 =  ⇒ Double lines shown "relation of spouse" 

—  ⇒ Horizontal line shown "relation in same generation other than spouse".

     ⇒ Rectangular box shown " Male".

     ⇒ Circular box shown " Female".

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