TWO positions of the same dice are given. Which number will be at the bottom if ‘4’ is at the top?

1

The numbers 1, 6, 4 and 5 are on the adjacent faces of number 3.

In both figure 3 is common then start with a common number in a clockwise direction

3   1   6

3    4   5

therefore

1 will be opposite to 4

6  will be opposite to 5

3  will be opposite to  2