Step 1: Understanding the Dice Positions
In the two given positions, the number 4 is at the bottom. To determine the number on the top, we observe the relationship between the sides of the dice.
Position 1: The visible numbers are 1, 2, and 3.
Position 2: The visible numbers are 1, 6, and 5.
Observation: The number 4 is at the bottom in both positions, and the numbers that remain on top in both positions are 1.
Step 2: Conclusion
Therefore, when 4 is at the bottom, the number on top will be 1.
Thus, the correct answer is (2) 1.