Given Data

1. In one view, 1, 2, and 3 are visible together.
2. In another view, 1, 4, and 5 are visible together.

Question

Which number is opposite 1?

Answer

6.

Solution

1. The faces 2, 3, 4, and 5 are each shown with 1, so all are adjacent to 1.
2. A face has four adjacent faces and one opposite face.
3. The only remaining number is 6, so 6 is opposite 1.