There are four houses in a row: House 1, House 2, House 3, and House 4. The colors of the houses are Red, Blue, Green, and Yellow. House 1 is not Blue. House 2 is Green. House 3 is not Red. What color is House 4?
Answer: B. Blue
House 1 is not Blue and House 2 is Green, leaving House 3 to be Yellow, which means House 4 must be Blue.