![m - \times \frac{m - 1}{2} =1 - \times \frac{m - 2}{3} m - \times \frac{m - 1}{2} =1 - \times \frac{m - 2}{3}](https://tex.z-dn.net/?f=m++-+%5Ctimes+%5Cfrac%7Bm+-+1%7D%7B2%7D++%3D1+-++%5Ctimes+%5Cfrac%7Bm+-+2%7D%7B3%7D+)
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