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...rticular application of the more general formula that there are [[binomial coefficient|<math alt="nCn-m">\binom{n}{n-m}</math>]] mutually perpendicular ''m''-plac ...m}</math>]] formula when ''n''&nbsp;=&nbsp;''m''&minus;1, since [[binomial coefficient|<math alt="nC1">\binom{n}{1}</math>]] is simply equal to ''n''.