Statement 1: Elizabeth has four children.<br />Statement 2: Two of the children have blue eyes and two of the children have brown eyes.<br />Statement 3: Half of the children are girls.<br />If the first three statements are facts, which of the following statements must also be a fact? a. At least one girl has blue eyes.<br />b. Two of the children are boys.<br />c. The boys have brown eyes.

Correct Answer: b only

Since half of the four children are girls, two must be boys. It is not clear which children have blue or brown eyes. So only statement (b) follows.