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If 'A + B' means 'A is the father of B', 'A - B' means 'A is the sister of B', then what does 'P + Q - R' mean?
P is the father of R
P is the brother of R
P is the uncle of R
P is the grandfather of R
P is the father of R
Break the expression from left to right: first find the direct parent-child link, then determine sibling relationships to establish the final relation.
Break the expression from left to right: first find the direct parent-child link, then determine sibling relationships to establish the final relation.
Analyze First Segment (P + Q)
According to the given code, '+' means 'is the father of'. Therefore, P + Q means P is the father of Q.
Analyze Second Segment (Q - R)
According to the given code, '-' means 'is the sister of'. Therefore, Q - R means Q is the sister of R.
Combine Relationships
Since P is the father of Q and Q is the sister of R, Q and R share the same father. Thus, P is also the father of R.
B: P is the father, not the brother of R. C: P is the direct father, not an uncle. D: P is the parent generation, not the grandfather.
A is correct because P is the father of Q and Q is the sister of R, which makes P the father of R.
In blood relation expressions, always evaluate step-by-step from left to right, identifying gender and generation gaps to avoid confusion.
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