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Portal:Mathematics/Did you know/22: ... that there are 115,200 solutions to the ménage problem of
permuting six female-male couples at a twelve-person table so that men and women alternate and are seated away from their partners?
Portal:Mathematics/Did you know/30: ...that people are significantly slower to identify the
parity of zero than other whole numbers, regardless of age, language spoken, or whether the symbol or word for zero is used?