Below there are three different positions of a dice. Find the number of dots on the face opposite to the face with one dot.

as 1, 3 5 and 6 are adjacent to 2 in all the three positions, if 3 is opposite to 5 that we came across from the figures. So it is obvious that one will be opposite to 6.
For the better understanding take a dice ans apply the same steps which is mentioned above.