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If 'A + B' means A is the father of B, 'A - B' means A is the mother of B, and 'A * B' means A is the brother of B, what does 'P + Q - R' signify?
P is the grandfather of R
P is the brother of R
P is the father of R
P is the uncle of R
P is the grandfather of R
Visualize the family tree: P+Q makes P the father of Q. Then, Q-R makes Q the mother of R. Since P is the father of the mother (Q) of R, P is the maternal grandfather of R.
Visualize the family tree: P+Q makes P the father of Q. Then, Q-R makes Q the mother of R. Since P is the father of the mother (Q) of R, P is the maternal grandfather of R.
Analyze P + Q
Given P + Q, where '+' means father, P is the father of Q. P is male.
Analyze Q - R
Given Q - R, where '-' means mother, Q is the mother of R. Q is female.
Combine Relationships
If P is the father of Q, and Q is the mother of R, then P is the maternal grandfather of R.
B: P is the parent of the parent of R, not the brother. C: P is the grandfather, not the direct father of R. D: P is the grandfather, not the uncle of R.
A is correct because P is the father of Q, and Q is the mother of R, making P the maternal grandfather of R.
In blood relation expressions, always define gender first. If the question asks for a relationship that is not strictly grandfather (e.g., just 'grandfather'), maternal grandfather is classified under the umbrella of 'grandfather'.
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