Three positions of a die are shown. In a fourth position 2 is on the bottom and 4 faces you on the left. Which number is on the right-hand face?

4 is seen with 1, 6, 2 and 5, so 4 is opposite 3; 2 is seen with 5, 4, 1 and 3, so 2 is opposite 6; that leaves 1 opposite 5. With 2 below, 6 is on top. Now tip picture (i) over to the left: its right face 6 comes to the top, the front face 4 stays in front, and the face that was underneath, opposite 1, which is 5, comes round to the right.