Computes n choose r * \param [in] n * \param [in] r * \returns \f$\displaystyle {n\choose r} = * \frac{n!}{r!(n-r)!} = \frac{n\times(n-1)\times(n-2)\times\cdots(n-r)}{r!} * \f$ */
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no outgoing calls
no test coverage detected