Three different positions of the same dice are shown. Find the number on the face opposite the face showing '3'?

1

Step 1) In figure IIIrd and IInd, 4 is common

Step 2) The number ‘4’ is common in both the dice, but it is at a different position. In order to find out, the number appearing on the opposite face, rotate the dice in a clockwise direction with the common number as the reference.

Step 3)    4    3    5

                4     1    6

Step 4)   3  is opposite to 1

               5  is  opposite  to 6

              3 will be opposite to 1