If A + B means A is the brother of B; A - B means A is the sister of B and A x B means A is the father of B. Which of the following means that C is the son of M?

A. M - N x C + F B. F - C + N x M
C. N + M - F x C D. M x N - C + F

• answer:D
  M is the father of N and N is the sister of C.C is brother of F..
  so,N and c and F are siblings.
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• D. because M is the father of N, N is the sister of C. this implies M is father of both N and C
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