1. I alone is sufficient while II alone is not sufficient
  2. II alone is sufficient while I alone is not sufficient
  3. Either I or II is sufficient
  4. Neither I nor II is sufficient
  5. Both I and II are sufficient
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1 Answers

Answer: Option 4

From II, we know that N is K's son and K is B's grandfather. Thus, N is the son of B's grandfather i.e. N is either father or uncle of B. From I, B is the daughter of M. So, M is either father or mother of B. Clearly, the correct relationship between M and N cannot be deduced.

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