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How many sons does D have ?

Statements:

1. A's father has three children.

2. B is A's brother and son of D.

  • A.1 alone is sufficient while 2 alone is not sufficient
  • B.2 alone is sufficient while 1 alone is not sufficient
  • C.Neither 1 nor 2 is sufficient
  • D.Either 1 nor 2 is sufficient

Answer: C

Correct answer: Neither 1 nor 2 is sufficient

Statement 2 establishes that A and B are both D’s children and that B is a son, and statement 1 adds that there are three children in all. But the sexes of A and the third child are never given, so the number of sons may be one, two or three and cannot be determined.

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