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A * B means A is the sister of B
A $ B means B is the mother of A
A + B means A is the brother of B
A = B means B is the father of A.
Which of the following means M is the maternal uncle of N?

  • A.M = P + Q * N
  • B.N + P = Q * M
  • C.N * P $ Q * M
  • D.None of these

Answer: D

Correct answer: None of these

For M to be N’s maternal uncle, M must be male and a brother of N’s mother. Taking the options in turn: the first makes M’s father the brother of N’s sister, which settles nothing; the second makes Q both the father and the sister of others, a contradiction; and the third does put N’s mother Q beside M, but only as Q is the sister of M, which leaves M’s own sex open. Nothing establishes the relation, so the answer is none of these.

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