The number 6 is common to both positions of the dice. We assume the dice in fig. (ii) to be rotated so that 6 remains on the FR-LH face (that is, on face IV as per activity 1) and the numbers 1 and 3 move to the faces hidden behind 4 and 5 respectively [in fig. (i)]. Then, 5 lies on FR-RH face (that is, face I), 4 lies on the top face {that is,(face V), 3 lies on RR-LH face (that is, face III) and 1 lies on Bottom face (that is, face VI). Thus, 3 lies opposite 5. Hence, when the top is 3, then the number at the bottom is 5.