Which number is on the opposite surface of number 3?

The correct answer is Option (1) → 4

On a die, a face is never seen beside the face opposite it. So every number that appears next to 3 in some view is ruled out, and the one number left is opposite 3.

• First view: 3 is seen with 5 and 6

• Second view: 3 is seen with 6 and 1

• Third view: 3 is seen with 2 and 1

• So 3 touches 1, 2, 5 and 6; of the six numbers, only 4 is left for the face opposite 3