Three different positions of the same dice are shown. Find the number on the face opposite the face showing the number '6'.

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 If two dice have the same face value in the given image then their clockwise or anticlockwise wise number are known as opposite numbers in dice.

From the above digarm All the numbes comes on face with 6 except 5. and we find that 

2 ↔ 3

4 ↔1 

So,