Although modern probability theory dates to the 1600s, our ancestors have been playing games of chance for a very long time. Via the amazing Cliff Pickover, for example, check out this ancient die (circa 2500 B.C.) from the Indus Valley Civilization. (Photo Credit: Lahore Museum in Lahore, Pakistan.)
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On modern die, opposite faces add up to seven. Since you can see both two and five in the photo, this does not appear to be the case here.