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If A + B means A is the father of B, and A - B means A is the mother of B, how is P related to R in P + Q - R?
Grandfather
Father
Uncle
Brother
Grandfather
Break the expression into individual pairs: P+Q means P is father of Q; Q-R means Q is mother of R. Since Q is the father's child, and Q is the mother of R, P is the father of the mother (maternal grandfather).
Break the expression into individual pairs: P+Q means P is father of Q; Q-R means Q is mother of R. Since Q is the father's child, and Q is the mother of R, P is the father of the mother (maternal grandfather).
Analyze the first operation P + Q
Given A + B means A is father of B. Therefore, P + Q signifies P is the father of Q.
Analyze the second operation Q - R
Given A - B means A is mother of B. Therefore, Q - R signifies Q is the mother of R.
Combine the relations
P is the father of Q, and Q is the mother of R. This makes P the maternal grandfather of R.
B: Incorrect, P is the father of Q, not R. C: Incorrect, P is the parent generation's parent, not a sibling or uncle. D: Incorrect, P is two generations above R, not in the same generation.
A is correct because P is the father of Q (R's mother), making P the maternal grandfather of R.
In blood relation problems, always identify the gender of the subject first to eliminate impossible genders; here, P must be male, which helps eliminate options that might suggest a female relationship.
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