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They don't HAVE to - it's just the way dice have always been marked. You could have a dice that has 6 & 5, 3 & 4 and 1 & 2 on opposite sides - it would still be a dice but wouldn't follow the 'opposites total 7' rule.

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14y ago

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Related Questions

What is the sum of all the dots on two three four and five dice?

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