Two different positions of the same dice are shown, the six faces of which are numbered from 1 to 6. Select the number that will be on the face opposite to the one showing '6'.

1

In all the figures, 6 is adjacent to all the numbers 2, 3, 4, 5 except 1 and share its boundary with all except 1

Therefore

1 is the number that will be on the face opposite to the one having '6'