TeX forrásszöveg:

\frac{\binom{4}{0}\cdot\binom{28}{2}+\binom{4}{1}\cdot\binom{28}{1}    }{\binom{32}{2} } =1-\frac{\binom{4}{0}\cdot\binom{28}{1}  }{\binom{32}{2} } (=\frac{4\cdot3+4\cdot28+12\cdot4+16\cdot4}{32\cdot31}=\frac{59}{248}  )