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A + B means A is the father of B, A - B means A is the sister of B, and A × B means A is the husband of B. What does P × Q - R mean?

1. P is father of R
2. Q is sister of R
3. P is husband of Q and Q is sister of R
4. P is brother of R

Correct answer: P is husband of Q and Q is sister of R

Solution

P × Q means P is the husband of Q. Then Q - R means Q is the sister of R. Combining both statements gives the correct relation.

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