Verbal Reasoning 3: Logic
This explanation is part of the Practice pack
Example 3
Text
Class C contains a minimum of 2 children and a maximum of 3 children who have at least 1 classmate who has a birthday on the same day and all children who have a birthday on the same day have blond hair. Lisa's birthday is December 2, but there is no mention of her hair color. Karin is blonde, but it is not known when it is her birthday. Peter and Kyra have their birthday on the same day.
Statement
Peter and Kyra cannot have their birthday on December 2.
Answer
Not true. There could be 3 kids having their birthday on the same day, so if Lisa has blonde hair, Peter, Kyra and Lisa could have their birthday on December 2nd.
It is possible that Peter and Kyra have their birthday on December 2, but it is also possible that their birthday is not on December 2. The statement states that this is not possible and is therefore not true. If the statement had been "Peter and Kyra are not having their birthday on December 2," the answer would have been "impossible to say." So pay close attention to what exactly is in the statement.