Question

‘D @ G’ means ‘D is the father of G’, ‘D # G’ means ‘D is the daughter of G’, ‘D * G’ means ‘D is the mother of G’, and ‘D – G’ means ‘D is the husband of G’. If A – Q * B @ R, how is A related to R?

A Father
B Husband
C Son
D Father’s father
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