There are 30 different ways to put the numbers 1,2,3,4,5,6 on the faces of an ordinary 6-sided die, one number on each face, if you count two rotated dice as the same.

Why? Well, there are 6! = 720 ways to put numbers on the faces, but there are 24 ways to […] https://mathstodon.xyz/@johncarlosbaez/114178920558516328
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