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Which of the following means Q is the grandfather of P?

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

Answer: D

Correct answer: None of these

Taking the options in turn: P + N * M * Q makes Q the great-grandchild of P, not the other way about. Q * N * M + P puts three generations between Q and P, making him P’s great-grandfather. Q β M β N * P makes Q the brother of P’s father - an uncle. None gives a grandfather, so the answer is none of these.

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