Clues

1. Three boxes contain one ball each: red, blue, and yellow.
2. Box A does not contain the red ball.
3. Box B contains the blue ball.
4. Box C does not contain the yellow ball.

Question

Which ball is in Box A?

Answer

The yellow ball is in Box A.

Solution

1. Box B is fixed with the blue ball.
2. Box C cannot be yellow, so it must contain red.
3. Box A receives the remaining yellow ball.