If the numbers on opposite faces of a standard dice always add up to 7, select the number that will be on the face opposite to the one having 5.

Three positions of the same dice are shown: Position 1 shows (1, 2, 3), Position 2 shows (1, 3, 5), and Position 3 shows (1, 5, 6). Select the number that will be on the face opposite to the face showing '4'.

Two positions of the same dice are given. Which number face is opposite to the face with 6?